Posts Tagged ‘20 minute’

Using 20-Minute “Mud” to Repair Sheetrock Damage

March 31, 2017

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When the homeowners had their powder room vanity top replaced, the shorter new backsplash left a 1″ area of torn drywall around the top of the new backsplash. There was a height difference between the drywall and the wall (which was covered with at least two layers of old wallpaper). This needed to be evened out before the new wallpaper could go up.

Because torn drywall will bubble when it gets wet, I used a penetrating sealer called Gardz to prevent this by sealing the raw area. Once that was dry, I used 20-minute joint compound to “float” over the damaged areas.

The bag says “5” (see photo), but that is misleading. What they mean is that you have five minutes to mix the powdered material with water, stir smooth, and then work with the stuff, before it gets stiff and hard. The actual drying time is more like 10-20 minutes, and sometimes longer.

Once it’s dry, it can be sanded smooth. Wipe off the dust with damp sponge, let dry again. Then it can be sealed with a primer, and I like the penetrating sealer Gardz, once again, to seal this porous joint compound material.

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Sheetrock Patch is Too Wet to Hang On

December 20, 2015
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A hole got punched into the Sheetrock, and the contractor put in a new piece of drywall, taped, and then floated with 20-minute joint compound. That was yesterday. Well, I got to work this morning, and the patch is still wet. (White is dry, around the edges, grey is wet, over the new patched in piece.)

Doesn’t make sense, as 20-minute mud is supposed to dry in … 20 minutes; even a deep patch would be dry overnight.

Anyway, I could not repair the wallpaper, because the patch was too wet to sand or seal with primer or hang paper on … too many potential problems.

We will hope it dries sometime soon, and I can go back and make their wall look a little nicer.