Use a flat scrap of wood to even and smoothen out the surface and let this dry for a few hours or overnight.
Tile over cement block.
Used thinset and concrete screws to install the backerboard then redguard over the backerboard before tiling.
They are screwed into the wall and are waterproof and thermally insulating.
If the paint comes loose so does the tile.
Clean the surface of any dirt or debris with a ph neutral cleanser and a sponge or scrub brush.
Then flush and fill the areas with cement.
Remove as much debris as possible from the wall so the concrete.
You should either strip or bead blast the concrete and thoroughly clean it.
Wet a section of the wall again to.
There are quite a few ways to prepare a block wall for tile including direct mortar cement board kerdi board and a layer of liquid membrane.
Construction board panels are extremely light and easy to cut but they provide a very strong durable and waterproof surface on which tiles will be installed.
First chip the bumps cracks and dents on the concrete wall with a hammer.
But we had to install 1 2 inch tile backerboard to bring the tile up and over the tub lip.
The backerboard provided a smoother surface to tile on.
Mix surface bonding cement with water to a pasty consistency.
You could set your tile right on the block if it is flat enough some block work i ve seen has convinced me that the masons were drunk on the job and there is no paint or other coatings that thinset would have a hard time bonding to.
The easiest product to use on a cinder block wall is.
Rinse the cleanser away with clean water.
Had to chip off all the thinset with an electric chisel.
For application over an uneven concrete surface a lightweight waterproof construction board must be used as an alternative to concrete board in a tile installation.
Answer it is possible to bond porcelain tile to a painted surface but it isn t recommended because the overall tile attachment is limited to the strength of the bond of the paint to the concrete.
Kerdi board building panels can be used to create a ready made flat and plumb surface on the cinder block wall.
How to install ceramic tile over painted block walls for a shower.
Clean debris off the wall with water and a sprayer.
Once the cement is dry apply the bonding agent that should give the surface a rough texture.