When the contractor waterproofed our shower pans he was also supposed to waterproof the shower benches.
He came back to apply a different kind of waterproofing to the shower benches.
First he applied a flexible waterproof caulk in a tube to all the corners of the benches.
Then he covered the entire area and up the wall above the Kerdi with a waterproof membrane called RedGard.
The RedGard paints on with a roller and/or brush.
It’s pink when wet and dries to a dark red.
The installer told us that these two flexible waterproofing materials make a very secure base for tile.
Do you have a secret weapon?