A few tiles on the top of our bath hob cracked and sections fell off. Turns out it was a bit of a shoddy job initially with wall tiles and a rubber based glue. I was hoping to just patch up with some replacement tiles for a short term fix. I removed the remaining sections but I’m concerned about some small holes in the underlying yellow membrane? Is this the waterproofing(I thought it was generally blue/grey)? Given it’s not on the floor can this be patched up or could we waterproof over the top of the new/existing tiles?
