I ordered 2 tubes of this with a quantity of V-groove panelling as a means of fixing it to the wall. I put a continuous bead round the edges and more diagonally across the back of the first board. It spread well under light pressure, and after about 10 minutes I thought it would be stuck, but no, the silicon slowly parted and the board fell off. So I put some more hefty blobs on the back of the board and after 25 minutes it was well and truly stuck. The downside is that I had to hold it under pressure for too long before it went off. This is not practicable when there are a lot of boards to be secured by adhesive alone. I was recommended to use an Evo-stik mastic adhesive called 'sticks like s***' by a professional plasterer, which retails at 75% of the price of the BTF silicon and actually does what it says - sticks the board to the wall permanently in less than 2 minutes! So sorry Cutmy, your mastic is over priced and ineffective. I won't be buying any more from you. (The v-groove boarding on the other hand is cracking stuff).
