like the topic title said, "how do you repair cracks"

this is the story, i just bought this new front c-one front its an cheap but new one, when it mail boi came in, i wasnt home so my dad just sign it without check the bumper, to see if there any damage or cracks, and now i got a bumper that have a few cracks in it so i was wandering how to repair the cracks? like what tools to use and where can i get it. thanks for your time.

pics?

typically you'd sand it down some then refiberglass it back together. resand and fill then resand till smooth.

Will fiberglass adhere okay to that plastic whatever-it-is material that bumpers are made of? My bumper also has unsightly ass crack and as we all know, crack kills. I was thinking of using some plastic epoxy resin stuff along with something to support it, and basically gluing it from the back, and filling the hairline with bondo or some type of filler before sanding and painting it. I take it this is a bad idea?

Sorry if I'm jacking the thread, I just figure it's still relevant and applicable though

This post has been edited by GriffGirl: Nov 18, 2008 - 3:25 PM

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here's a few picture so you guy get the idea of what kinda of cracks on my bumper. its not the best pic cuase im using my cell but its should give you an idea.







This post has been edited by Toyota_Celica_97: Nov 18, 2008 - 3:43 PM

body filler. if you kno wat your doin, its magical

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OEM bumpers are made of polyurethane. Fiberglass dosen't stick to polyurethane unless you prime it first. (or unless you've made an isotopic/epoxy/synthetic polyester blend that does stick like me ) (BTW: Matt & shannon, it's still holding!! ) so anyway. if you can pull your "cracks" together, than clean the back (unpainted) side. pull the cracks together and tape the front (painted side) prime the now clean back (unpainted) side. Allow to dry. Turn peice face down; Apply the proper mixture of fiberglas resins (with catalist, duhh) to the primed & dryed side and allow to seep into any of the "crack" that may be left. Coat over with a few small squares of FG cloth and continue to layre the cloth with more resin. allow to fully dry. if done properly then the reverse side should have little to no crack left. any remaining crack can be filled in with one of those ghetto "paint-pens" and then buffed a little bit to fade in unnoticibley.

Note that this is the cheaper way of doing it. If you are a profesional body guy, then you and me both know that this is a band+aid solution, that works pretty well for $8 or less

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body filler



refiberglass

thanks alot everyone that been giving me advise, i will be using bondo on the smaller cracks and use fiberglass on the bigger on that's chipping off.

If you use MACRO mode, you'll have a clearer close up shot.

Well, Not only does it depend on the material that ur repair but the material ur using aswell. Like if ur trying to repair a minor crask u don't even need a fiberglass repair kit. Just head down to ur local hardware store or walmart and pick up fiberglass filler. Its just like regular bondo but it has fiberglass resin already premixed in. The kit typically come with hardener. All u do is mix the hardener and filler together spread it evenly on both sides of the crack wait for it to dry and start sanding it smooth just like bondo. Oh yeah, it take a little longer to sand than bondo does.

808, after looking at your pics, just use some filler for the first pic. those arn't cracks, those are scuffs. Sand it down, fill it up, sand it smooth, prime and paint.

second pic see above. Tape off the edge when you goto fill it in.

This post has been edited by D-Man: Nov 26, 2008 - 9:19 AM