notice it says no need for pva, what about bondit ? would you still need that for the likes of mr or tile backerboard? or concrete?, a plaster that goes on anything without the need to treat the substrate?, im not to sure they are not giving to much away ive just googled again and come across the plasterers forum where its been discussed, and one thing sticks in my mind that someone brought up what about suction? is this plaster resistant to suction?, i have trailed a product from bg before at college years ago, it was a pva/bonding agent, you was supposed to be able to plaster on wood with it, it dident even make it to the shelfs, i wonder if this will