Let the wall dry thoroughly.
How to install ceramic tile on painted wall.
Sanding the existing paint helps the tile adhesive stick to the wall.
Scrape the paint off the concrete wall or use a blaster.
To avoid any overlapping brush strokes start in one corner and work your brush strokes or roller down the tiles then across the area or wall.
Apply even pressure to force the air out of the thinset and to make firm contact between the layer of thinset on the tile and the layer on the wall.
Be sure to put spacers between each tile as you go.
You can leave the paint on drywall provided there are not several coats and the tile epoxy will adhere with no problem.
Once dry sand any high spots to create a level wall.
If the wall was painted prior to wallpaper installation follow the instruction for painted or textured walls.
Use long sweeping motions to apply mortar to the wall and start placing your tiles in the marked locations.
Spread a smooth layer of thinset on the back of the first tile and press it firmly into the notched layer on the wall.
Likewise if you have plaster follow the instruction in that section.
If you have a large surface to paint use a roller for covering the tiles more quickly.
Remove any remaining dust oil or grease with tsp tri sodium phosphate or an ammonia based cleanser.
Spread the mortar over the walls using the flat of a notched trowel pushing the mortar through the lath and onto the painted blocks.
Place the level horizontally on this line and.
Measure up from the bottom of the wall the height of the tile.
Patch any holes or cracks with spackling compound.
Check the tile for plumb and level then proceed to the next tile.
To install ceramic wall tile use a level and measuring tape to mark the tile locations on the wall with chalk.
Scrape away any loose or peeling paint or wallpaper.
Add water to the mortar while mixing until it s the consistency of peanut butter.
Allow the mortar to dry overnight.
Add another 1 8 inch to the height measurement and place a mark on the vertical line.
Use a paintbrush to paint the edges and hard to reach areas like corners first.