Cracked Bumper

Harbinger · Post by **Harbinger** » July 11th, 2006, 1:33 pm

I've got a cracked bumper on the front of the car and wondering how to fix it with out replacing it. I just need a temp fix, only thing I can think of is epoxy in behind till I can get some cash to replace it.

Ideas?

PATDIESEL · Post by **PATDIESEL** » July 11th, 2006, 2:42 pm

Factory or aftermarket bumper?
Factory, not really fixable. You can take the bumper off, push the crack back flat with the rest of the bumper. Then put duct tape over the back side of hte bumper and lay some fiberglass over the area about 6 inches from the crack on all sides. Then when the fiberglass is dry take the tape and glass off. The glass is now molded to the shape of the backside of the bumper. Clean the back side of the bumper with some brake parts cleaner and then rough up the surface of the urethane with some high grit sand paper. Use Epoxy to glue the glass molded piece to the bumper being libral with the glue. Squeeze the glue out by applying pressure the glass and then lay something heavy on the glass until it dries. This will create the best bond possible. If the bumper is twisted much the glass will pop off and you have to start al over. So be careful when putting he bumper back on so that the glass stays attached.
If it is a aftermarket bumper it is made of fiberglass alread and you can basically follow the steps above. Except do not use tape and just place the fiberglass directly to the bumper. Sand the back side after the glass patch dries and then use body filler on the front side to fill in the crack.

hgallegos915 · Post by **hgallegos915** » July 11th, 2006, 10:12 pm

We fixed my factory rear bumper.. well my uncle did.. have NO IDEA how the how he did it... I know he did not use bondon because ive already bumped intoother cars and it did not crack.. ill ask him.. maybe he melted it abck or something.. ill ask. hes the one who did my paint job.

Harbinger · Post by **Harbinger** » July 12th, 2006, 9:45 am

Not sure if I'm gonna do it now, I noticed that theres a 1" hole missing out of it. Honestly, I might as well wait to see if I can get rid of the rust forming above the windshield and back of hatchback before I worry about the bumper.

MazdaManiacMx3 · Post by **MazdaManiacMx3** » July 17th, 2006, 10:27 pm

You can fix urethane bumpers, there is a product called flexible bumper repair kit , its a 2 part formula you mix together than is soft like urethane and completely sandable , kind of a pain in the butt to work with but it works , It also comes with a metal screen to fix holes.
Go to your local body shop supply center they should have it .
Im thinking 3m made it but I'm really not sure
Hope I helped
Thanks
Kris

hgallegos915 · Post by **hgallegos915** » July 18th, 2006, 2:11 am

well basically what he did is sanded it down.. foberglass ..sanded down and even out..primer and paint ant it looks new... however ther slightest bump supposebly cracks it.. it has survived a small impact to one of my cars on accident while backing up..

MazdaManiacMx3 · Post by **MazdaManiacMx3** » July 18th, 2006, 3:17 am

Only problem with fiberglass is that it does not bond particularly well with urethane , also the fiberglass resin has no flexibility so when the bumper flexes even from the wind it tends to crack or peel off
Kris

hgallegos915 · Post by **hgallegos915** » July 18th, 2006, 6:28 pm

mines still good 2 go, ive had it for 2 months.

PATDIESEL · Post by **PATDIESEL** » July 18th, 2006, 11:56 pm

If you mix the resin properly it will flex. Also, if you need it to flex use a tad less resin. The fiberglass will flex, but if you drown it in resin it won't.

MazdaManiacMx3 · Post by **MazdaManiacMx3** » July 19th, 2006, 12:36 am

Yes but even if you mix the resin soft it still gets that white color over time and seperated from its bonding surface , which it doesnt stick to Urethane particularly well in the first place ..

hgallegos915 · Post by **hgallegos915** » July 19th, 2006, 1:31 am

well if that was to happen.. all you do is simply re do it? it snot impossible to fix sheesh. Like is aid i fixed mine and i have been ok.. ive fiberglassed since i was very young. There is no reason why we should try to fix it. Other solution is simply getting another bumper?

MazdaManiacMx3 · Post by **MazdaManiacMx3** » July 19th, 2006, 10:08 am

Oh, no , by no means am I trying to be pushy telling you it's wrong and trying to make you fix it , I'm sure it may hold , in fact if you prep the surface area correctly I know it will hold , how long I don't know maybe a couple months or maybe forever , I just wanted to spread the word to all the urethane owners out there that there is a product specifically designed to fix their bumpers , which is relatively inexpensive, and mostlikely more durable than the fiberglass fix only due to the fact that it's completely flexible . It almost reminds me of a sandable chewing gum that maintains structure .. haha

I just hope I helped , If I could find my kit I will take a picture of it so you know what to look for
Kris

hgallegos915 · Post by **hgallegos915** » July 19th, 2006, 8:47 pm

hmm what product is this? it sparks my interest.. hmm

ariesdude · Post by **ariesdude** » July 21st, 2006, 4:18 pm

Is this the urethane repair kit -
http://www.autobodysupply.net/Duramixplasticrepair.htm

http://www3.3m.com/catalog/us/en001/aut ... utput_html

http://www.paintscratch.com/cgi-bin/sho ... howItem=36