Has anyone heard of prolastic mortar? It's being recommended to me by a tile shop, but at $50.00 for 50lbs I want to be sure it's worth it. It's supposed to be a kit with the powder and a polymar liquid additive. I'm putting ceramic over an old ceramic floor (or the cement that was below it). Thanks for any help.
I've heard of it. Its a very flexible type of adhesive used for going over substrates that have flex, or give, like a not too solid floor that bounces when you walk on it. the main benefit of it is to prevent the tile from cracking due to too much movement. It is expensive stuff, never worked with it though, but have used the next level down of 2 part adhesive, which is the powder and latex type, very sticky stuff needed for large wall tile, the size around 10 x 16 type.