just a quick question, i'm tiling a bathroom tomo where the walls are uneven. I've already primed the walls and filled the really uneven places with rapid set addy. What addy should i use to tile? stick with the rapid set or use something that will give me a longer working time as the walls are still not perfect? The tiles are ceramic but some will need extra addy behind to keep it all level. Sould i use a 10mm notched trowel aswell or will an 8mm do? any advice welcome!!