If you re not sure if you have lead paint test kits are available.
How to install tile on plaster walls.
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.
Wall preparation is an important step when you in install tile on a painted wall.
This surface provides the right base for laying ceramic porcelain or other types of tile.
You should not tile over wallpaper glossy surfaces lead paint or plywood.
However tiling over tile can add quite a bit of thickness so make sure your wall can handle the weight.
Some preparation and a certain style of installation makes the process easier and more successful.