Well, it is true you only get one chance...that could be good and that could be bad. I mean... you only get one chance because it is THAT good. The sheet will NOT come off. Thats why I like it. I laid a piece of newspaper between the two sheets and put the sheeting exactly where I wanted it. While I hold it there, someone else gently pulls out the newspaper. All I can say is that mine turned out perfectly. Its also been my experience that if you cut your sheeting slightly larger than your foam wing you can cut it down to fit or even sand it down for a nice fit.

Mike