hey. i got a question. iam currently copying a black widow sides for my 2001 accord sedan. problem is, i dont know how many layers of fiber glass should i lay on it. can anyone tell me? i want it thick but it wont easily crack... i kno if i hit something it will break. but besides that... because sometimes if its too thick, it will just crack... so can anyone tell me how many layers of fiber glass should i lay?