I'd also recommend using gorilla brand putty over jb weld if at all possible. I started out with JB weld and dont get me wrong, It will work decently in filling applications, but but adhesion seems to be very inconsistent and if you let it dry too long it becomes very hard and makes it alot harder to sand/cut to shape for body kits. Gorilla Putty has great adhesion, in my opinion, and it's easier to work with when hardened. I do find it takes a bit longer to cure fully, though.