Thread: fibergalss fun

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Try using a heat gun, if the area isn't too large. Don't over do the heat. An oven cure could be used on a small part. It's important to get enough hardener into the mix. For small batches, you need to have a reliable measuring device and use 10-12 drops per ounce (for the Bondo resin). I've done most of my fiberglass work in the winter, when my shop is only at 68 degrees and never had a curing problem. If I think that the resin is curing too slow, waving my heat gun over the area (briefly) has always done the trick for me. I have a 1 ounce measuring cup that I use for small batches.

I found one small area on one of my fiberglass fenders where the resin was still gummy, after more than a year. The car had been out in the sun a lot, but that didn't do the trick. I ground the gummy material out with a rotozip bit and applied new fiberglass to the area.