Fiberglass Hole In The Lower Bumper

Repairing fiberglass is very easy. I would remove the bumper from the car if you want to do it right. Are you planning on repainting the bumper when you are done, or do you just want to patch the hole and put the skid plate back on?


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Is the original part made with a hard or flexible resin? If it is made with a hard resin, a fibreglass repair kit should do the trick. If it is a more flexible plastic infused with glass fibres, then consider using the glass fibres, but instead of using the resin in the fibreglass repair kit, use a two part flexible epoxy. I have done this many times to repair motorcycle fairings. Even better reason to use a black 2 part epoxy is that it would color match. I would try to patch it from the opposite side.

 

Search West System fiberglass repair on Amazon and watch their instructional videos on YouTube. I've used their stuff to repair fiberglass on boats in the past and it worked well. I'd say spray with trim paint and you're good to go under there.

Ray

 

Forgot to add - if it is flexible a bumper repair kit should have the correct type of glue. Oh, wear thin rubber gloves.

 

You may also use large packing tape (the cheap brown variant) in order to "mold" the fiber glass.

1) Apply tape to your fiberglass.
2) Cut the fiberglass to the exact shape you want (the tape does help here as the fiberglass would otherwise be a mess)
3) Apply this shaped patch of fiber to another layer of brown tape that is twice the size of your patch.
4) Add a reasonable amount of epoxy to the fiber glass
5) Apply the whole of it to your hole.

See before (pink) / after (yellow) :

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If you have access to thin carbon cloth or kevlar, the result will look much better.

(that's how I fix the kevlar wings of my RC gliders that have made an unexpected encounter with the earth)