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Old 09-16-2018, 10:46 AM
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SPider cracks through epoxy prime ?

Hi all im painting my first fiberglass body, i just put on 2 coats of epoxy primer. After while inspecting body i see 2 spider looking patterns on the back door. Can someone give advice how to repair. im not to sure when it comes to fiberglass.

Thank you .

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Old 09-16-2018, 12:16 PM
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There are guys here much more serious about fiberglass repairs but I have dabbled in it. In a nutshell, you'll need to grind away the cracks even if they go all the way through. If they do, that just means you'll be doing a back side repair along with the front. If you feel the location of the defect is in a sufficiently obscure area and have several year expectations rather than lifetime... You might get away with dishing it out and using filler for a time but it will show up later. Use actual fiberglass to repair the fiberglass, body filler next for contour, use an unbroken (not sanded through) layer of glazing putty then as gelcoat replacement and feather it in. I prefer a high build polyester primer surfacer for repairs such as this because it is more like the fiberglass and fillers which are also polyester products and will react most similarly to the glass during heat and cold cycles whereas urethanes tend to shrink more over time. This may not be normal in the modern world, but I personally know no reason that epoxy would be needed for a fiberglass job. It is a valid application for epoxy but if epoxy were absent I would not go get any for glass work. Just my feeble .02.
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Old 09-16-2018, 01:25 PM
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Thanks for the info ill be starting bodywork in the next few days. .. I used the epoxy just to help protect the fiberglass a little more. And i keep reading to do the bodywork over epoxy prime , then 2k prime,Sealer, top coat. I could not see any cracks in the gel coat but after the black epoxy there they were..

Thanks again for the info .
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