yeah, found that myself,mixed enough to do en-suite walls and utility floor (they were both slate) ended up skipping half of it 'cos it had set.My guager was like excalibur stuck in bucket!:lol:One of the independant tile supplier's I buy my material's from has sample's of mapei, I tried the grout for the first time it go's off faster than any I've used before but got a good finish, hope they decide to supply mapei