anyone w/ body work experience

[extremeskiier728]

ok so im working on molding a hood scoop to the stock hood. first i stripped the hood to the metal used and epoxy to attach scoop to hood and then used body fill to mold and put smooth transition to it. the scoop is abs material i think. and the problem i have came when after it was all nice and sanded and prep i put a coat of charcoal color primer on the entire hood and set it the sun for good curing. the damn fill started to peel away from the scoop. im sure its cuz of the heat. and sun.

possible solutions i thought of
1. reapplying fill and letting cure in the sun for a day to allow contraction before sanding and finishing.
2. use fiberglass resin Jelly as a fill agent istead.
3. order some metal or aluminum based fill i saw on the eastwood company site. (says its stronger and more durable.)

any input

[jhill98]

the issue is that the metal and the fillers expand and contract with heat at different rates, so sitting the whole thing in the sun you're asking for trouble. You need to find something to fill the gap that will either be a bit flexable so that the heat/cool in the sun won't crack it, or find a filler that is similar in thermal expansion to the metal hood.

I have a friend with a steel '86 cutlass hood, that has a big cowl scoop on it and he has been yearly fixing the seam between the fiberglass scoop and the hood. It has been getting better over the years, not so much of and issue.

[extremeskiier728]

ok well i was thinking i would just go over top the existing fill with some resin jelly since that is somewhat flexible.

[Chris88CL]

You can also try using slightly less hardener in the body filler.
Your never going to have a perfect transition from abs to metal for a great period of time though.