Thin Blue Plastic Tape Keeps Paste Off The Wall

Panel of wallpaper lying on my pasting table. The left edge will go up against a painted wall that is not to be wallpapered. It’s important to keep paste off this wall, because the paste can cause the paint to crackle and flake off. Yes, you can wipe paste off the wall, especially if it’s a gloss paint. But better to not get paste on the wall in the first place.
So I’ve placed a strip of this cool blue plastic tape along the edge. It sticks to the pasted wallpaper, but will not let paste get onto the wall.

Here is the wallpaper in place, with the little 1″ overage wrapping onto the wall to the left. See how the blue tape is preventing paste from getting onto the wall?
Once I finish trimming, I will remove both the excess paper and the blue tape. Be sure to remove any blue tape that is still behind the wallpaper.
This also works for ceilings and for abutting another strip of wallpaper.
This tape is much better than painter’s plastic or ” caution tape ” because it is lightly tinted so you can see it, it’s translucent so you can see through it, it has the perfect body – thicker than painter’s plastic but more flexible than caution tape, and has a unique textured surface that makes it handle nicely, plus you can easily snap it apart so there is no need for scissors or razor blades.
It’s made in Japan and tricky to get. If you’re interested, email me at wallpaperlady@att.net and I’ll hook you up with the supplier.
The very edgy wallpaper? It’s by Spoonflower and called Serpents and Apples .

Paint Peeling Off The Wall – A Bad Harbinger

Prior to prepping for wallpaper, I’ve removed a hanging shelf. It had stuck to the paint, and pulling the shelf off the wall also took some of the paint along with it.

This is a bad sign. If paint will release from the wall so easily, it’s an indicator of an unstable surface underneath, that the paint is not able to bond to.

That also bodes poorly for any coatings applied on top of it, such as my smoothing compound, primer, and wallpaper.

The most worrisome of these is wallpaper. Because unlike other substances, wallpaper expands when it gets wet with paste, and then as the paste dries, the paper shrinks a tad and puts stress / torque on the wall. If the underlying surface is unstable, these layers can actually pull apart, resulting in a ” popped ” seam.

This is not a ” loose ” seam and cannot be simply glued back together. It’s layers deep inside the wall coming apart / delaminating from each other, and virtually impossible to really repair.

So what causes this? Do a Search here to read my other posts on this topic. But causes can include incompatible surfaces, such as old oil-based paint covered with newer latex paint, gloss paint covered with new paint without proper prep / de-glossing, chalky or calcimine paint, or coatings applied to a dusty wall.

In all these cases, the top coatings won’t be able to adhere tightly, and can result in what you see here – the top layer(s) of paint pulling off the wall with just a little stress.

Even worse, in my world, is the potential of the surface beneath wallpaper seams coming away from the wall.

Starting to Smooth a Textured Wall

This is a typical wall texture provided by many builders of new tract homes in the suburbs of Houston.

Wallpaper doesn’t look good hung over this texture, because the bumps will show through. And the high-and-low ridges and dips interfere with good adhesion to the wall. So this accent wall will need to be skim-floated to smooth it before the wallpaper can go up.
In addition, this wall started out with a semi-gloss paint. I worry about my materials being able to stick to a glossy surface.

So, before applying the smoothing compound, I am priming the wall with something that will stick to the gloss paint, as well as provide a matt finish for the smoothing compound to adhere to.

I’ve discovered that my favorite wallpaper primer also works great for this purpose. It sticks to just about anything, and dries almost dead-flat. I like Roman Pro 977 Ultra Prime.

I use a trowel (top) to spread on the smoothing compound. The 3″ stiff putty knife is used to knock off big-ish chunks on the wall, or bits of grit. I use the 1 1/2″ flexible putty knife to apply the smoothing compound in tight spots like around electrical outlets or between a door molding and a wall corner.
The smoothing compound I use is drywall joint compound, and I like the Sheetrock brand Plus 3 version. Search hear (upper right) to see previous posts with photos of this material.

Bottom of photo – trowel sticking to the wall shows you just how tacky this stuff is. Above that are blobs of the smoothing compound waiting to be spread around, and a little bit on the left initially smoothed onto the wall. At the top of the wall you see a section that I have already covered with the smoothing compound. This will dry overnight, and I will sand it smooth tomorrow.
Sometimes I can float a wall, get it to dry, sand it smooth, prime, and hang the paper all in one day. But this texture is so heavy that more time is required for it to dry, so it will need an overnight sit. Some fans, plus the home’s heat and/or air conditioning help to pull moisture out of the smoothing compound and hasten dry time.

Peel & Stick = Bad Stuff. Don’t Fall For It!

he lure of (false!) claims of easy to install and easy to remove led these homeowners to purchase peel & stick ” wallcovering ” and try to install it themselves. It did not go well. The wall was coated with a gloss paint, as per manufacturer’s instructions. Yet, here you can see that it is not even trying to adhere to the wall.

Many brands come in rectangles of a few square feet, rather than traditional strips that are long enough to reach floor to ceiling. These small rectangles are much harder to keep perfectly lined up, so you are very likely to end up with overlaps or gaps at the seams.

It’s not pliable or malleable, so won’t readily be eased into corners or turns. Here, note wrinkles and warps in the corner in the center of the photo, and at the ceiling line in the center top of the photo.

The wall was not smoothed before applying the paper, so you see unsightly texture. The roughness is also interfering with good adhesion, because the paper is only sticking to the tops of the bumps, instead to the entire surface.

So much for easily removeable. As you can see, trying to take this stuff down – it took the paint along with it.