Remove any remaining dust oil or grease with tsp tri sodium phosphate or an ammonia based cleanser.
Tiling over a painted wall.
Walls can take on a new look when old paint is covered by new tile.
Or prime and paint the entire wall room before starting with your tile project.
The board must be fastened and prepared to support a tile installation as the surface finish.
If your paint tests positive call a professional.
Things you will need orbital sander 80 120 grit sandpaper safety glasses dust mask rags tape measure pencil 48 inch spirit level mastic or thin set mortar grooved trowel tile spacers tile cutting tool grout grout spreader sponge grout haze remover optional distilled white vinegar optional.
For instance if you are tiling over a painted.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
Weight of the installation.
Then give a couple of coats of pva or sbr bond.
Flatness of the substrate.
I would suggest marking just below where the tiles are to finish.
Choose the right materials for the location.
If you re not sure if you have lead paint test kits are available.
I tiled on emulsion thinking i would get away with it.
Only on the boarder tile mind.
The moisture in the cement makes the emulsion go soft and it can loose its grip on the wall.
Additional considerations for a vertical tile installation on gypsum board include.
Choosing the right tile.
Scrape away any loose or peeling paint or wallpaper.
However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
The board is not being prepared for painting papering or any other surface finish.
Start by removing any molding switch plates outlet covers and other hardware attached to the area being tiled.
Your good to go just make sure the tiling and grouting is done to a very high standard if water is able to pass to the wall you will end up with damp problems.
Score the wall with a stanley knife all over the area to be tiled the more heavily the better.
Wall preparation is an important step when you in install tile on a painted wall.
Answered 19th jan 2017.
Previously painted textured drywall prep.
With the exception of glossy paint any type of painted wall including textured paint can be tiled as long as the wall itself.
Score a line and then using a wall paper scraper see if you can lift the paint from the wall before tiling.