Oil based paints can create a problem with tile installation consider removing this paint with paint remover or via sanding the paint away prior to installing the tile.
How to install tile on plaster walls.
Wall preparation is an important step when you in install tile on a painted wall.
Plaster walls became popular due to the durability and strength of the surface and are more common in historic homes that drywall.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
One handy tip my father in law taught me three years ago was if you plan on tiling a wall and the wall is uneven then the plastering doesn t need to be abs.
Some preparation and a certain style of installation makes the process easier and more successful.
If you re not sure if you have lead paint test kits are available.