hi all,i thought you didnt need to use a flexible adhesive when putting ceramics onto a concrete floor only when using porcelain,,was told today by a tiler on the job i should be using flexi?? is this correct? bit confused now

also whilst im on the subject what is the actual difference between a 1 part and a 2 part flexible adhesive? havent actually use a 2 part flexi yet ,cheers
