Well i have just used this stuff for the first time, followed the instructions as shown and it seemed all good, broke off the peices to the size i wanted. Decided to put in a bowl of water first and glad i did and it went really really milky, so i washed it out and added some fresh water again went milky i repeated this process till it stayed clear and then added to the tank.
Seems to be holding fast at the moment an have stuck my montipora frag to the live rock and stuck another frag down. It has clouded the water slightly but not too much...
I have a couple more to fix tommorow see how this effects the tank first