Crash is right on.For anyone that ever uses the foam, it's important not to stretch it when sticking it to the jamb, and to press it down firmly. Like backtaping, it takes some skill to apply it successfully. I will readily agree that if someone is going to apply 4 coats of clear, the foam is probably not designed for this. I would also say that novice-applied backtaping might present similar difficulties in a 4-coat scenario as well.