While some installers may suggest scoring the painted surface to improve adhesion, this is not a recommended long-term solution. Paint is a film-forming product; if the paint loses its bond with the drywall underneath, the weight of the tile and mortar will likely cause the entire section to peel away. To ensure a reliable installation, the paint should ideally be removed, or the surface should be mechanically abraded until a rough, porous surface is achieved that allows the mortar to bond directly to the substrate. If you are working on a renovation and are unsure of the existing paint's durability, performing a test patch is a good preliminary step, though not a guarantee of long-term success. For projects where longevity is the priority, installing a thin layer of cement board or a specialized uncoupling membrane is a safer, more professional approach than relying on a painted substrate. If the wall shows signs of peeling or flaking, do not attempt to tile over it, as the structural integrity of the base is compromised.
Key considerations
- tiling over painted wall
- how to prepare wall for tile
- tile bond failure
- Surface Prep
- Paint
- Bonding