Polyurethane Bumper Repair
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.
Products Used:
EcoPrep Plastic Cleaner: https://www.polyvance.com/products/ec...
Grinding Burr: https://www.polyvance.com/products/di...
Mini-Weld Model 7: https://www.polyvance.com/products/mi...
Flex Filler: https://www.polyvance.com/products/fl...
Waterborne Primer: https://www.polyvance.com/products/wa...
Timestamps:
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
⚠️ Important! ⚠️
Always wear appropriate Personal Protective Equipment (PPE) when performing any repair work.
The duration shown in Polyvance’s repair videos is for demonstration purposes only. It does not reflect the actual time needed to complete a full repair and should not be used for estimating labor or repair times.
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