Hi everyone, I'm a DIYer with a week's training how to tile. I am about to tile my shower. I plan to use a tanking kit first such as the MAPEI one. My question however is, would the trowel scratch the surface of the cured membrane, causing a breach and negating any waterproofing done?
Don't worry about scratching the waterproofing paint. Just don't apply to much pressure when you trowel the adhesive. The paint is strong enough to withstand the normal trowel pressure.
