Hi Ilia

Thanks for your advice I will do as you say, I was thinking of keeping the finished work in the tray, if it turned out good enough,but after reading Gary's postings I don't think it would be a good idea. Would I be right in thinking that the water would not be sucked through the plaster.

I got confused with the sand, the silver silica sand made me think it was a different product altogether, how long would it take for the silica to fall off? I ask because someone else used this in a fresco and that was the basis it was recommended to me.

One more question can fresco be carried out on plaster board,if thats the right name for it?

Thanks for your help

Ed