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Im working on my Integ- widebody (which intails a lot of Molding). My kit consists of front/back bumper, front fenders(both sides), rear quarter pannels (both sides), and sideskirts. What I did, was rivet the pieces on (sometimes bolting them on to make them sturdy), then fiberglassing then bondo. I made sure that all the pieces were securly fasened before I fiberglass/bondo to make sure they didnt crack. But, I molded the quarter pannels on w/ just bondo and they started cracking so I had to re-do it w/ fiberglass then bondo.
Bondo by itself WILL crack but if you put fiberglass before the bondo, it should be cool.
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