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Unread 10-17-2020, 09:39 AM   #9
Moderator -- Mud Man
Davy's Avatar
Join Date: Jan 2003
Location: Princeton,Tx.- Dallas area
Posts: 33,021
When tiling directly over paint, sometimes the moisture in the thinset will cause the paint to easily turn loose from the wall. The primer you installed might prevent this but I'm not sure. I have lightly sanded the paint and tiled over it without problems but as an installer, we never know what type of paint was used or if a primer is behind it. So, I like to wipe the wall/paint with a wet sponge, give it a couple minutes and wipe it again. Give it a couple more minutes to soak in and see if the paint will peel off. Most of the time the paint peels off with ease. Then I paint the wall with Mapei's Eco Prime grip. That will give you a good tiling surface.

Another choice of thinset is white Custom's Pro light. It's sold at Home Depot and is non sag, which usually helps when tiling walls.

Another sealer choice is Miracle 511 porous plus. Also from HD. It's solvent based which has deeper penetration and seems to work better than the water based sealers.
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