Mix and apply the selected tile adhesive with a suitable notched trowel.
Tile adhesive painted walls.
You want the tile adhesive to have something to grab onto.
For large tiles only a flexible tile adhesive like webercol flex should be used.
Sand with a medium grit sandpaper to create a uniform surface that s not too smooth.
Thoroughly vacuum the area and give the wall a once over with a damp sponge or cleaning cloth.
If the walls you want to tile are concrete walls with paint on them remove the paint before you install tile so the tile adhesive has something to grab onto and hold the tile in the correct place.
If the substrate is non porous porcelain tiles etc priming is highly recommended with webercol prime.
You can leave the paint on drywall provided there are not several coats and the tile epoxy will adhere with no problem.
Acrylpro professional ceramic tile adhesive is a professional acrylpro professional ceramic tile adhesive is a professional formula adhesive with high bond strengths.