This is the bottom of the strip , where it meets the wainscoting . It needs to be pushed into the right-angle between the wall and the molding, so the excess can be trimmed off. No matter how gently I push, or what tool I use, or how carefully I approach this, some papers buckle and fold and crease as they are bent backwards into the corner . The wallpapers that do this are typically the thicker and ” puffy ” non-woven / paste the wall materials. It happens in just about every right-angle corner. Luckily these areas are usually not in the line of sight, so not very noticeable. Note that many non-wovens are thinner and more flexible , and do not present this behavior.
Yesterday’s install was quite fun, but there were some unusual or challenging features to the room. Here are some of them. First, in most areas, the chair rail had a sort of gap between it and the wall, probably then filled in with caulk. I used some craft paint from Texas Art Supply to color that in, so there wouldn’t be white showing between the dark green paint and the black wallpaper. My usual trim guide (not pictured) is thin, designed to allow you to cut very close and tight to the edge. But in this case, I was afraid it might leave some of that gapped area showing between the paper and the wood trim. So I used this steel plate tool, which is thicker and would allow me to get a fat cut – just enough paper left to wrap a teeny bit onto that gap area. Note that before I trim, I’m going to press that edge into the corner. I couldn’t hold the camera and hold it in proper position at the same time. Also, you’ll notice the rolled edge at the top of the tool. That’s thicker, and allows for getting an even fatter cut, for instance, when you want just a tad of paper to wrap around a corner . Do a Search to see my previous post about this technique. Here I’ve made the trim cut and am peeling away the excess that was trimmed off at the bottom. See how the bottom edge of the wallpaper now wraps a tiny bit and fills the gap neatly?Next issue – wall height. On this wall, the height is 3′ + 30.5″But on the opposite wall, the height is 3′ + 29.75″. This means that you can expect the ceiling to move up or down, which means that a pattern motif – let’s say one of those cute chameleons – could get his head chopped off by the descending ceiling. Next issue – bowed wall. Here my yardstick is sitting pretty squarely against this wall, in a corner . But as I move it up the wall a little further – wow! – that wall takes a dip to the left. And it’s quite a dip! The wall has a bow in it. I can get my next strip of wallpaper to cover that space. But the fallout will be that pattern motifs will hit the wall at different points, which means that the next piece to be placed after that, the pattern will not match perfectly at all points. All right. So that previous corner had a bow. This one is out of plumb. Here you see my laser level showing that my wallpaper strip is hanging nice and plumb.But move the laser to the corner and you see that it’s out of plumb .Here’s a better example. Again, this causes the pattern to not match perfectly in the corners. Another shot of the bowed wall, which, for various tech reasons, due to Word Press ‘s crappy New Editor , this shot got out of order and I was not able to place it with the others under the topic. Papering around the electrical outlet , I had to unplug my light source. There was light coming in from the hall. But this paper, as well as the paint, were so dark that I couldn’t see well to work. Enter my Big Larry flashlight .Small enough to fit in my toolbox , but really bright and dependable for when you need it. The pattern is called Fantasy Tree and is by Breeze and was purchased through one of the showrooms in one of Houston’s decorative / design center s. It’s a nice non-woven material , easy to hang , easy to remove , durable and stain-resistant .
Dining room before. This bungalow in the Woodland Heights neighborhood of Houston is very true to the Arts & Crafts / Craftsman period. This style featured straight , clean lines , nature , and muted colors that mimicked those found in nature . The homeowner is a retired woodworker / carpenter and did much of the millwork you see here. Done. The teal green is actually a little more muted than the photo shows. From another angle. Close-up. This wallpaper pattern is called Fir Tree . A frieze is a wide wallpaper border , usually run around the middle or top of a room . The manufacturer is Bradbury & Bradbury . They specialize in period-inspired patterns from past eras, such as Victorian , Arts & Crafts , Oriental , Modern Age / Mid Century Modern , and more. Bradbury prints on stock that’s about 28″ wide, and this border is about 13″ wide. So Bradbury prints two borders side-by-side , and then you need to use a straightedge and razor blade to cut them apart .Although the border came about 13″ wide, the space between the beams was only about 11.5″ . So we were going to lose about 2″ . I consulted with the homeowner. He really wanted to see the copper metallic pine cones. We also felt the trunks of the trees were important design elements . We decided that the pattern could afford to lose more from the top , which would permit more of the tree trunks to show, all the while preserving those pine cones. Here I am trimming 2″ off the top, so the overall height of the frieze is now 12″ . That will fill the space between the beams, and also allow a little bit to tuck down below the bottom beam (there is a gap between the wall and that beam). The room was really dark , the wallpaper was dark , and my straightedge was casting a shadow where I needed to trim. So I grabbed my Big Larry flashlight from my toolbox and was able to see where to trim. Bradbury uses inks that are quite delicate , and can be scratched or marred simply by brushing with my smoother brush , or my plastic trapezoid squeege smoother tool . Metal – like a trim guide or scissors – will also leave marks on it . Here I’ve wrapped tools in microfiber towels and baby socks , to soften contact with the wallpaper . Bradbury inks and substrates can be finicky, and it’s important to use the paste recommended by the company for the particular colorway that you’re hanging . In this case, I had to use clay – based paste . The inks and substrate aren’t always compatible , so when you add wet paste to the back , it can cause the substrate to absorb moisture and swell , while the inks on the surface are holding tight. This will result in wrinkles , warps , and bubbles on the surface . We call this quilting or waffling . One trick is to lightly sponge clean water onto the inked surface. This will allow the surface to absorb moisture and expand hopefully at the same rate as the backing , hopefully eliminating wrinkles and bubbles . On this install , I still had problems with uneven expansion . And with the paper drying out before I could get an entire strip up on the wall. So, while I was pasting the back, I also sprinkled a little water on the back and mixed it in with the paste . This did seem to even out moisture , and also help the material remain moist and workable during the installation . In addition, I also had trouble with the edges of the paper drying out before I could get a full strip up on the wall. Part of this was because it’s winter time and the furnace was blowing hot air into the room and drying out the paper. My counter-attack was, again, to sprinkle a little water onto the back, to hydrate the material more. Also, once I had pasted a strip and rolled it up (see below), I dipped the edges into about 1/8″ of clean water. And then wrapped the pasted material in a plastic trash bag and allowed to book for a few minutes before hanging . This is standard procedure with wallpaper. Actually, what worked better was to paste, book, bag, and then just before hanging to dip the ends into water. This seemed to keep everything wet and workable better and longer. Despite all this, some small bubbles did remain in the paper. As the paper dried, though, they flattened out. When you book a strip of wallpaper, customarily you fold the top 1/3 down and the bottom 2/3 up. This keeps paste from smearing all over everything, and makes each strip shorter and easier to handle. And allows you to get the top section of the pattern lined up with that on the previous strip , before unfolding the bottom section and working that against the wall. But it’s a little different handling a narrower border that’s maybe 12′-15′ long. What I do to make this manageable is to book the material in accordion pleats . See photo. Then I can unfold just a small section, work it into place, and then move along the strip, smoothing just a small section at a time against the wall. Actually, with this install, I positioned my sections against the wall temporarily, to get the whole 15′ strip up there. And then went back and smoothed each section against the wall, working out bubbles and warps , and ensuring that the frieze was pressed tightly against the wall at both top and bottom . There were four strips around the top of this dining room. On each strip I used a different install method. By the time I was done, I had learned how the material wanted to be treated. The homeowners are in love with this period-authentic look for their vintage bungalow. The husband said it was like Christmas, because they had waited for so long to have this room completed, and now it’s finally finished and beautiful!
The rich colors and clay coating give this wallpaper a truly luscious , velvety look. But they’re also fragile and can be damaged easily . Here you see damage caused at the factory simply by folding back the last 2″ or so of paper, before rolling it up. The company does provide and extra foot or two to accommodate this. You have to be extremely careful handling this stuff. Even a fingernail or your wallpaper tools can cause scratches or marring . Per the manufacturer’s suggestion, I covered my smoothing brush and plastic smoother with microfiber towels , to minimize chances of scratching the paper . In fact, the manufacturer suggested that, during installation , that you wipe the entire surface uniformly with a damp microfiber rag , to even out any imperfections that might have resulted . Now, just between you and me – if you know you have a product that’s likely to end up with blemished areas, why not just switch to a better , tried-and-true ink ? SMH Luckily project this is a border that will be butted up under the ceiling , so no one’s going to zero in on a few shiny areas in the matt ink. But , think of all the homes that will have this same material as a wall paper , that will be viewed close-up . Not all colorways from Bradbury do this. I’ve hung plenty of it and not had a problem with most. In fact, the “fishnet” area you see at the bottom of this picture is not delicate at all. It’s the very matt finish green and brown colors in the center of the border that are so delicate . The inks and clay coating the manufacturer uses on this particular colorway are very fragile and mar easily , so I’ve used ankle socks to cover the edges of my straightedge, and also a weight I’m using to prevent the paper from rolling around on my table. And that scissors is just there as demonstration for the photo … you can bet that tool was not touching the surface of the border at any other time. This material has a selvedge edge that has to be trimmed off by hand , with a straightedge and razor blade . Normally I set my straightedge on top of the wallpaper , because it’s easier to see where I need to make my cut , and also because the weight of the straightedge helps hold the wallpaper down. But even with cushioning socks on either edge of the 6′ long tool , and with padding on the underside, I was afraid that it might harm the inks . So I placed it on the outside edge of the wallpaper. This left very little for the tool to grab on to, so I made sure to press it tightly against my work table , so the wallpaper strip wouldn’t slip around while I was trimming . The manufacturer is Bradbury & Bradbury . They specialize in historic and period-correct patterns from the 19th and early 20th centuries.
I have no idea what’s going on here, but it happens from time to time. I had been rolling on wallpaper primer in two rooms for a few hours . I’m suspecting I held a tool in a certain way for a long time , or somehow blocked circulation to a part of this finger . It doesn’t hurt , but it is a little swollen. The color got darker and lighter during the rest of the day. I did some shopping on the way home, and the store was cold , and that seemed to exacerbate the issue – finger got cold and numb and really purple . Back at home in my nice warm home office , it’s still discolored , but not as much.
Grasscloth is a natural material that cannot be matched from strip to strip, so all the seams will be visible . In addition, there is usually a slight but noticeable color difference between strips / panels (called shading or paneling ) . So it’s important to plot the layout of the strips to give the most visually pleasing overall look. Usually this means balancing the width of strips so they are all equal , at least on the same wall . We call this engineering . This wall presented particular challenges , due to the widths of the elements. Grasscloth comes 36″ wide . You can use your straightedge and a sharp razor blade and trim it down to any width you want. The width of both the large wall spaces to the right and left of the bank of windows was 34.” The width of each window was about 35.” The width of the two spaces in between the windows was 7.” So you’d think I could trim my panels on either side of the windows, and then over the windows, to about 34″-36″ – give or take a few inches (or fractions thereof). But that would leave me with two 7″ wide strips between these 35″ panels. Although the look would be uniform and mirror-image from the center outward, moving from right to left you’d have: 35,” 35″, 7,” 35,” 7,” 35,” 35,” … those 7″ breaks were just not going to look right. One option was to determine the width of the wall (189″) and make each strip an equal width. This worked out to six strips, each at 31.5″ Not good, because this would mean a seam down either far side. And since those sides were 34″ wide, that would mean a 31.5″ wide strip and a strip 2.5″ wide. Not attractive at all, and it would use up an extra strip of wallpaper. This six strips @ 31.5″ wide scenario might also land with a seam smack in the middle of those 7″ wide interludes in between the windows. Not attractive at all. So I decided to make the two outer strips 35″ wide. That left 119″ of wall space above the windows to be covered with wallpaper. Do some math and you get four panels of 29.75″ wide. This gave a balanced and uniform look to the area over the windows, and also prevented seams from landing between the windows. Moving right to left, I cut and hung the full length outer strip first. Then I cut and hung the strip over the window on the right. Then I measured to find the centerpoint of the window in the middle. Turns out it was a bit less than 29.75″ away. So I trimmed that next over-window strip accordingly. Once that was in place, I measured from that center point above the middle window out to where my left full-height panel would fall, 35″ out from the wall. Took the resulting measurement and divided by 2. Lo and behold, each of the next two panels over the window was going to be a bit wider than 30.” No problem. No one (but a paperhanger or maybe an engineer) is going to notice a 1/4″ or even a full 1″ difference in widths between this strips over the windows. Another thing to point out … it’s important that I took measurements before cutting these strips for this second left-hand section. Because, since grasscloth comes at 36″ (and walls can be wonky), if my strips had been narrower (say, 28″), that last full-height panel on the left might have ended up needing to be 37″ wide – and that wouldn’t work because it only comes 36″ wide – plus you need at least 1/8″ to wrap around the corner. Luckily I had the flexibility to be able to trim the panels over the windows to any width needed, to accommodate all this. If you’ve followed all this so far, let me also toss in that we also need to figure how to get paper in between those windows. More on that below. In this scenario, I’m moving from right to left. Area beneath the windows needs to be treated in the same way, and preferably with widths that match what’s going on above the windows. In addition, it’s tricky because after you move across 12′ of wall space, the strips above and below the windows are going to twist and torque out of shape, so that last full-length panel on the far left might not butt up perfectly with the last strip under the windows. The grasscloth is black , and my wallpaper primer is white . It’s common for teeny gaps to appear at the seams . In this case, it’s likely that white wall would peek out from those gaps. So I like to stripe under where the seams will fall with dark (diluted) paint . This takes measuring , plotting , and also a heat gun to get the paint to dry before the wallpaper hits it, to avoid staining. You can do a Search here to read more about this technique . Now let’s talk about getting wallpaper in between those windows. As you can see in the photo, if I hang a 30″ wide strip, a whole lot of paper is going to be cut off and thrown away. Also, a whole lot of sticky, pasted paper is going to bump against that window molding and maybe even the window glass. A lot to clean up! And unwieldy, to boot. My solution was to stop the wallpaper just a little below the tops of the windows. Then I would patch in a 7″ wide strip in between the windows. This is trickier than it sounds, because, if it were a paper wallpaper, I could simply cut along a design motif and overlay the 7″ wide piece. But grasscloth is thick and overlaps don’t look good. Also grass has no design elements , and the reeds of grass don’t necessarily fall perfectly horizontal , and even if you cut everything perfectly true to square , if the window molding is a teeny bit off-plumb , then your edges won’t butt up perfectly. So that’s a good reason for striping the black paint under where the butt join will occur. Same thing for the sections under the windows. I measured and positioned the strips so that the top edge (which I had trimmed to be perfectly horizontal) fell between the narrowest part of the windowsill molding, for less visibility. I admit, instead of butting the two pieces, here I did overlap the 7″ wide strip about 1/4″ onto the piece under the window, right at that narrow junction. It’s only about 3″ wide, and I figured no one is going to be examining it that closely, anyway. This saved me about a half an hour of measuring, trimming, testing, repeat, repeat. This is my second window interlude, and by this time I had realized that it’s hard to trim stiff grasscloth around intricate moldings precisely . So I used paint to fill in the edges around the window molding, just in case there might be any gaps between the grasscloth and the molding, so you would see black instead of the white molding paint. I did this with a small sponge; if I had used an artist’s brush it would have been a bit neater and tighter to the conforms of the molding. But sometimes you’ve gotta relax and realize that no one’s going to be scrutinizing the insides of moldings below shin-level. Area over windows finished, with drapes back in place. Turns out this particular grasscloth is so uniform in color (quite unusual, I will add), that you can’t really see the panels , nor their equal widths , anyway. I’m still glad I took the time to do all this math and trimming. Area below the windows, done. That last seam on the left bears some explanation, too. Moving across the top of the windows, I measured that that last strip – the full-length strip – would need to be exactly 35″ wide. It butted up nicely to the last strip above the windows. But, due to twisting , shifting , expansion , unlevel and unplumb walls and ceilings , and other factors, there is a really good chance that that last 35″ wide strip would not butt up perfectly with the last 30″ wide strip under the window . So I planned to splice these last two strips together. Yeah, the drapes are hanging there, I coulda overlapped the two strips about 1/2″ and the drapes would have covered it. With a thin wallpaper, I probably would have done this. But grasscloth is thick, and an overlap would be visible , and also the adhesive / paste can’t be trusted to adhere as well to grass as it would to paper . So I plotted for a splice. Instead of trimming my last strip under the window to 30″ (read above), I trimmed it to 32″ wide. That way, when I hung the last full-length strip to the left, which was 35″ wide, it overlapped the piece under the window by a few inches. Then I did a double cut and spliced the two pieces. See below for details about that technique. Grasscloth is 36″ wide, and this wall area is wider than that. So two strips were needed. This means you’re going to have a seam, and since grasscloth seams are always visible, it looks best to plot to have the seam fall down the center. It uses more wallpaper to do this, but it looks much better than having, for example, a 36″ wide strip next to an 8″ wide strip. As mentioned above, in case you get thin gaps at the seams, a dark stripe of diluted craft paint under where the seam will fall, will prevent white wall from showing through. Rounded / bull-nosed edges and corners have been popular in new construction for at least 10 years. I wish they’d go away. They’re very difficult to trim around, and hard for the paper to conform to and adhere to. It’s very hard to trim around that rounded edge, because the paper is hanging over and blocking your view, because grasscloth is thick and stiff and your fingers can’t feel through it, and because the edges aren’t necessarily true and plumb so a laser level or other level won’t help you much. I use this little gadget as a trim guide. It’s actually a small section of the same corner bead material that drywallers use when they assemble these walls. Cut to about 1″ long and notched in different places where you might trim along the edge of the wall. It’s intended that you place your trimming knife in one of the notches and slide the gizmo along the edge and make your cut. I find that awkward and also inaccurate. So I prefer to use the notches as a guide and mark where I plan to trim with a pencil. Since this wallpaper is black, I used this marking pencil from my home sewing kit instead. Chalk might work, but I was afraid it might now wipe off completely. The pink pencil line was barely visible, but it was enough for me to use a scissors to trim along the grasscloth. I like this better than using a razor blade as I can see better, and also less chance of scoring into the primer or wall. Which raises its own set of issues – do a search here to find previous posts.Inside view of the trim guide. Finished arch. Note the four panels of equal width above the arch. And two flanking full-height panels also the same widths. I was lucky that there was no pattern to match, so I was able to butt my two flanking strips right up to the edge of the bull-nosed corner. No trimming needed! Then I measured the remaining width between these two strips (the area over the arch), divided by four, and cut four strips of equal widths. I hung the two on the left, and then one on the far right. This left one strip still to be positioned to the right of center. So the pieces are going to meet over the arch, rather than the last strip falling in a corner. Same as the last strip under the window (discussed above), it’s really difficult to get your last piece to fit in here perfectly. I’ve done it, but it takes a lot of measuring, trimming, testing, retrimming, and often starting all over again. So I did a double-cut / splice. A double cut involves cutting each strip an inch or so wider than it should be, and overlapping the two. Then you take a straight edge and sharp razor blade and cut through both layers. This handy tool is a wonderful non-slip guide for this process. It was invented by an installer colleague in the Wallcovering Installers Association ( WIA ) and she has them fabricated in various lengths (along with other cool tools ) and sells them on-line. Contact me if you’re interested. Anyway, it takes a lot of strength to cut through two layers of grasscloth, so somewhat difficult for lil’ ol’ me. You also want to be sure to not cut / score into the wall, because the tension of drying wallpaper can tug at the wall and cause it to actually come apart, leaving an open seam that’s difficult to repair. So you’ve got to put some padding under the wall where the cut will take place. I use special strips of polystyrene (hard but flexible plastic) to pad the wall. Also invented by a colleague in the WIA , who also sells other cool tools and supplies. Contact me if you’re interested. This black grasscloth was printed on a white substrate. If the seams aren’t absolutely tight, there can be worries about the backing showing through to the front. So sometimes we’ll take a piece of chalk or pastel (never oil pastel or permanent markers because they bleed and stain ) and run it along the edge of the paper – from the back, and taking care to not get chalk on the surface. I do this frequently with dark papers ( do a search here to see previous posts ) but opted not to do it with this grasscloth. It wasn’t necessary, and might have stained the porous reeds of the grass. It was beneficial, though, to have striped dark paint on the wall under the seams, as mentioned above. Ugh. Grasscloth comes 36″ wide, and this section of wall is 38″ wide. It’s not visually pleasing, nor is it easy from an installation point of view, to have a 36″ wide strip next to a 2″ wide strip. Or to use scraps and put a 25″ wide strip next to a 13″ wide strip. So best to plan two strips of equal widths. Two strips, each 19″ wide, with the seam down the middle. Actually, the strip on the left was 19″ wide, but I trimmed the strip on the right to 21″, because I like the wallpaper to extend 2″ over the top of the door molding. This provides a more stable surface in case of shifting foundation or walls, and less likelihood (knock on wood) of the seam opening up should the house / drywall experience shifting. Note that design “rules” caution against seams down the middle of spaces. But it would have been more visually distracting (and used up more paper) to have made three strips of each 12.75″ wide. And would have looked even dumber to have used scraps left from other walls and put together two strips of disparate widths. So the homeowner and I discussed during our initial consultation , and she was happy with the center seam. Once it was all finished, this particular grasscloth was so even in tone that you barely see the seams, anyway. Win-win! This did use up additional paper, though, as noted in a previous photo above.
The wall has been skim-floated and sanded smooth , primed , and is ready for wallpaper .The homeowner did a great job coordinating the wall and ceiling paint with the colors in the wallpaper. This is a room that’s made for sleeping!At first I thought the pattern scale was too small for the large wall. But once I saw it on the wall, I really like the way it fills the space. To me, this pattern has a sort of calico look. Close-up shows the light texture on the paper. This is a non-woven material, so I’m installing via the paste the wall method . Here I’ve cut and arranged all my strips in the order in which they will be hung . This is a drop match pattern , which some folks think of as A and B strips. Meaning, for instance, an orange flower appears at the top of the wall on Strip A . But the next strip, Strip B, has a yellow flower at the top. When you get to the third strip, we are back to an A and an orange flower. Next comes another B strip – and so on. I’ve rolled the strips backward , with the top of the strip coming off first. This will prevent the printed face of the wallpaper from bumping into the pasted wall during installation . Wallpaper often shrinks a tad when the paste dries , and this can result in very minute gaps at the seams . With dark wallpapers , it’s pretty important to take steps to prevent white from showing at these gaps. Here I’ve measured out where each seam will fall, and taken diluted black paint to make a dark stripe under each seam . I don’t make the paint full-strength, because wallpaper paste isn’t formulated to adhere to paint. I want the wallpaper adhering to the primer I’ve applied. That’s also the reason why you don’t want to roll paint over the whole wall. Also, I have only striped some of the seam areas, and will wait until some strips are up on the wall before striping more lines. This is because wallpaper expands when it gets wet with paste, which can make it difficult to plot the exact width of each strip as you move across the wall. I use acrylic craft paint from the hobby store, applied with a bit of sponge. I keep a small dish of water to dip the sponge into, which dilutes the paint a bit. You also see a stick of chalk pastel . See next photo.Besides the wall peeking out from behind the wallpaper seams , it’s also possible / probable that the white edges of the wallpaper backing / substrate will show at the seams. I take a stick of chalk and run it along the edges, making sure to apply from the backside, to avoid getting chalk onto the surface of the wallpaper. Be sure to use chalk pastels and not oil pastels – oil will bleed and stain wallpaper. Some installers use liquid paint or markers – again, be sure to use water-based or acrylic , and never oil based or permanent markers . BN Walls is the brand. Altogether, this was a pretty nice product to work with. It was thin and very soft and flexible (many non-wovens are not).I wasn’t happy with all the seams, though. I believe the paper was cut with dull or wobbly wheels at the factory, because the edges seemed to not be perfectly straight . So I ended up with gaps and overlaps in some areas. Here you can see the wallpaper edges pouching up a bit due to excess paper. But, as I mentioned, this material was quite flexible, so it was pretty easy to spread these edges apart an use a tool to push them apart and then down to prevent them from pouching up again. Once the paste started to dry, these areas held nice and tight and flat. This is a townhome in the Rice Military neighborhood of central Houston .
To protect the toilet from primer splatters, and the occasional tool that gets set on it. I tried the fuzzy covers they make for your grandmother’s toilet lids, but they were too bulky and didn’t fit right. Enter little kids’ T-shirts! They fit perfectly, are easy to transport with my dropcloths, come in cute colors and slogans, and, at 50c or so from Value Village (my favorite thrift shop in Houston), they can be replaced when they get too soiled.
So many of the new homes have these rounded corners and bull-nosed arches. It is tricky to get a neat, even trim along those edges.
I have a special tool that helps me get a straight trim line (do a Search here to see previous posts). But still, it’s not perfect.
In the last photo, the homeowners had the builder install wooden molding inside the window return, which is a much neater way to finish the window, IMO.
See the fuzzy stuff on the edge of this paper? This roll by Designer Wallpapers has shards of paper left by the factory’s trimming process. If left in place, they could cause gaps or rough looking seams.
A toothbrush has turned out to be a handy tool for scrubbing off these minute particles of paper.
The Wallpaper Lady's Blog 