Reading on the EternaBond site I found that Acetone was the prep chemical to use for my repair. I put a patch that was roughly 4 times the size of the hole in my roof material on. The hole was the size of a nickle and the kit came with 4" wide tape, so I put a 4" by 4" square on two different locations. The material is extremely sticky, then rubbing on it to activate it apparently makes it adhere even better? I didn't notice any edge lifting or bubbles with my application, I hope that helps your decision on prep chemical.