Polyurethane Bumper Repair

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Polyurethane bumpers like this old Camaro’s are pretty rare on late model cars, but with more people restoring cars from the 70’s and 80’s, there’s a need to be able to repair and restore polyurethane.
Polyurethane is a thermoset plastic. In the molding process, two chemicals are mixed and injected into the mold. It forms a solid through a chemical reaction. The molecules form crosslinks throughout the solid like vulcanized rubber. Because of this thermoset polyurethane is not meltable.
How do you know if your bumper is thermoset polyurethane? Look at the back side of the bumper for the ID symbol. If you see “PUR” or “RIM” molded in, you know urethane. If you can't find the ID symbol, if the backside of the bumper is yellow like this Camaro, you know it's urethane. Yellow bumpers are always urethane, but not all urethane bumpers are yellow. Some Toyota and GM urethanes can be light or dark gray, so don't go by the color alone.
This Camaro bumper has seen better days. It has some rotted and crack areas. In this video, we'll show you the process of how to repair a rotted-out area and a torn bolt hole. After the welds are done, we'll show you how to smooth the surface with our Flex Filler epoxy filter and our flexible waterborne primer surfacer.
Melting the urethane welding rod: 2:22
Sanding: 3:02
Torn mounting hole repair: 3:23
Applying filler: 4:21
Sanding: 4:33
Applying primer: 4:50
Finished look: 5:25
Look below for links to some of the products from the video.
View this video on our website for more information and product suggestions for this repair: Look below for links to some of the products from the video.
5700HT Mini-Weld Model 7 Airless Plastic Welder: goo.gl/UhRuV9
Flex Filler 2 Tube Kit: goo.gl/TyX4PJ
Waterborne Primers: goo.gl/ieGtam
Putty Flex with Cream Hardener: goo.gl/sEiamE
⚠️ Important ⚠️
- Always wear proper safety gear while working!
- The length of this video is in no way representative of the actual time required to perform a complete repair and therefore should not be used for estimating purposes.
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Опубликовано:

30 июл 2024

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Комментарии : 22

@polyvance 5 лет назад

Visit this video page on our website to see the full list of products used and other helpful tips: www.polyvance.com/video/polyurethane-repair/polyurethane-bumper-repair

@sereyrithyayeng7465 6 лет назад

good

@shifteeeeee 3 года назад

What wattage soldering iron would you recommend when using those rods to repair a bumper.

@polyvance 3 года назад

Our airless welders are 200 watts. To repair polyurethane, you really need to be able to adjust the temperature. For this reason, we recommend our Mini-Weld Model 7 (www.polyvance.com/Airless-Welders-1/5700HT/) as opposed to our other airless plastic welders.

@Sk1ds87 5 лет назад

I have a front bumper of an '84 Corvette that looks pretty wavy. Should I use flex filler to make it look straight again?

@scottb7600 5 лет назад

Try heat first. Get it hot by gently warning it with a heat gun (from one side only) and push the waves out by hand as much as possible. If that doesn't work then you can use the flex filler as long as you don't make it too deep. On corvettes, there is a lot of unsupported area on the bumper, so over time they tend to sag. I have also heard of others who reinforce the inside with a couple layers of fiberglass cloth to help keep the bumper from sagging further.

@Sk1ds87 5 лет назад

@@scottb7600 That's a great idea. Thanks!

@thegeneral3094 4 года назад

Paper mashing the inside will make it rigid

@robertwensel2523 5 лет назад

Will fiberglass stick to it

@scottb7600 5 лет назад

Yes, but not all that well. After a large urethane repair is done, its recommended you put a fiberglass patch on the backside to stiffen the area as the urethane repair is more flexible than the original material. Its not really carrying the load, it just keeps the area from flexing while installing the part on the car. Glass reinforcement is not needed on repairs like tabs, bolt holes, small tears, etc.

@kyriakosdimitrakis1891 Год назад

Where can I find your products? I live in Athens Greece.

@polyvance Год назад

Hi! You can view this page to find a distributor near you: www.polyvance.com/International-Distributors/

@QuackSuperStar Год назад

In 5:22 The spokesperson says to prepare the bumper for a sealer and a topcoat. Does that just mean a color basecoat and a clearcoat, or is there more to this I ain't hearing?

@polyvance Год назад

Yes, the "topcoat" would be a basecoat and clearcoat. You would use a sealer or primer before the topcoat.

@scottb7600 Год назад

A sealer is like a primer, but has no build. You put on a sealer so your color coat has no weird color changes in caused by the repair materials under the paint, after its sprayed. You could also use a properly tinted and sanded high build primer-surfacer. The topcoat refers to the color and clear coats.

@QuackSuperStar Год назад

Thanks Kings!

@QuackSuperStar Год назад

Can I paint directly over the welding rod material, or do I need to bondo it to get proper adhesion?

@Offthbadan Год назад

Ironically, I’m here to see how to repair an IROC bumper.

@thegeneral3094 4 года назад

Is this type of repair prone to rust

@polyvance 4 года назад

No. The bumper and welding rods are made of plastic.

@JUSTME-mb6lg 2 года назад

Lose the blo%#y music!!😖

@polyvance 2 года назад

We stopped using this music shortly after this video was published. This video is almost 5 years old, and unfortunately, we can't do anything about the music. I'm sure you'd like our newer videos!