I have a bit of an odd one, am doing a shop fit, client is having 100 x 100 ceramics on the bar top, bar has been constructed by 2 18mm who play sheets glued and screwed together, no apart from the obvious breakage issues, I am a bit unsure what products are best to use, was thinking of double priming ply then fixing antifacture/ uncoupling mate, the thin fleece stuff first, but adhesive I'm not sure what's best to use, same with grout? Any suggestions?