Make sure you ve filled in all the grooves and any openings on your existing surface.
Tiling over existing shower wall tile.
The proper way to tile over a fiberglass shower pan is to remove the pan.
Skim coat over your existing tile.
This gives the tub surround sealant a stronger hold.
This assumes that the floor underneath is solid concrete and that there are no cracks in the existing tile indicating underlying problems in the concrete.
Then rinse the wall with a water dampened.
This will guarantee your tiles to stick over pretty much anything.
My fil uses and recommends laticrete 272 mortar mixed with 333 additive.
If your old ceramic tile is worn or dated you can lay new tile right over the old and avoid the huge job of tearing out the old tile.
Most people dread re tiling because it often means that you need to remove all the old tiles first.
But this isn t always the case.
Let this dry before moving on.
Remove the faucet handle face plate spout and shower head.
Layer newspaper on the floor across the bottom of the tiled wall.
This essentially means laying a new layer of tiles over the old layer.
This isn t especially problematic if the pan was installed separately from the shower walls but it can be tricky if the pan is part of a one piece fiberglass stall and it may need professional expertise.
How to install a shower surround over existing tiles step 1.
Mix degreasing cleaner with water in a bucket using a dilution recommended by the cleaner manufacturer.
Scratch the tile with sandpaper to rough up the surface.