ive been trying a new adhesive this week which i got as a free sample from weber and i must say i love the stuff its for fixing all types of ceramic tiles including fullyvitrified/porcelain tiles to internal walls and floors. to external walls and floors to low porosity substrates such as power floated concrete or existing tiles.all that for £12 per 20kg bag trade.you can mix it with there primer/admixture and it becomes a 2 part adhesive. has anybody else tried it. pm me if u would like any samples i can give u contact details:8: