Hey guys, well the front ground effects (the super rare parts) on my 91 Trans Am 'vert have a bunch of cracks in them so I was wondering what would be the best way to fix em. I was thinking of gluing then throwing bondo on the cracks to smooth them out but I'm afraid that the bondo itself will crack since the plastic is more flexible. Here's a couple pics of what I'm deal with.





Thanks!

 

i epoxied mine and then used fiberglass resin over it to smooth it out. the fiberglass doesnt crack when it bends in the wind. worked great for my camaro. till I met the back end of a truck.

 

Most auto parts stores(Autozone/Advance/Pepboys/etc) have bumper repair epoxy in the body work section. Its a 2-part epoxy that comes in a syringe you mix up and put on the bumper/ground effects like bondo to patch cracks and holes.

 

sand the area 40 or 80 grit then....

 

Does that need anything on top of it (other than paint) or will it sand smooth?

 

Im not sure what your asking but that fillers waterproof and doesn't suck or hold in moisture so you dont have to prim and top coat right away

 

I tried both bondo/glass and epoxy resin. Both WILL....I repeat...WILL sheer off with an impact with a high curb, etc. I then purchased a product called duramix from 3M(check TCP global or 3M itself). It's a plastic weld that is a bit on the pricey side but the repair is stronger than the spoiler itself. You should be able to youtube it for a demo. The ground effects and front/rear bumpers are plastic....not glass. good luck

 

The ground effects are glass, the front and rear bumpers are urethane based

 

My front lip is cracked a bit, I have some fiberglass repair kit and see how it goes if not try some things this thread mentioned.

 

can't be.....I sanded both parts....they're the same material on my 91. I searched and searched and searched. I repaired the spoiler with duramix and then purposedly hit the same curb that sheered off my epoxy repair. The duramix held up

 

a body shop can plastic weld that stuff

 

DO NOT use this it will crack, its made for filling purposes not structural.... is the part plastic or fiberglas?
if its urethane (plastic) use this: http://www.emisupply.com/catalog/nor...term=NOR-04617

and this to reinforce it from the back http://www.homedepot.com/h_d1/N-5yc1...atalogId=10053 works the same as the one u get at autobody store but cheaper

i'll xplain the process if you go with this, and you don't have to coat it b/c its urethane

 

fillers are porous , specially bondo, its better to put primer right away

 

I agree I have used duramix and 3M they work ok but I weld all plactic parts with my welder

 

you might be interested in this thread

https://www.thirdgen.org/forums/auto...cks-fixed.html

 

the front spoiler is urethane based. i read the title of the thread and looked at the pics and jumped into posting before knowing it was the front spoiler he was talking about. the fiberglass filler will work but like menchend above hit a curb it will crack