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Originally Posted by john70t
I didn't know you could mortar tile to painted drywall..er how well does it stick?
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It doesn't if the painted walls are glossy or not uber clean. If the wall is to be covered with tile then the backing, drywall, cement board or plaster will never be seen again because you don't remove tile and save a wall.
So run a belt sander over the painted surface with a 24 grit belt and seal the roughed up surface. Modified thinset or mastic will stick to that.
Preparation is key but that's the easy part. Getting tiles on a wall that look really good from an acute side angle is were the experienced tower over the novice.