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Old 09-05-2019, 07:17 PM
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Can you fiberglass over epoxy primer?

My vehicle is unique, I don't plan on making it showroom floor worthy or anyting, but I won't get too much into that..I had to remove some fiberglass in order to then remove some rusty areas in the floor of the interior. I then coated it with epoxy primer in hopes that it would be the final coat considering it's in an inconspicuous area. That way I can get some other work done and keep the floor from rusting before the fiberglass stage. But I'm now learning that I may not be able to fiberglass over epoxy primer, though I've heard that you can scuff the primer with 80 grit and fiberglass over it depending on the fiberglass. I have Bondo fiberglass resin which I hope to put over the Raptor epoxy primer. Is there any way I can make this work? Thanks!

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Old 09-06-2019, 06:43 AM
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You can put fiberglass filler such as Dynaglass, Kitty Hair, Tiger Hair, Etc.. over bare metal prepped with 24 or 36 grit Roloc Grinding Disc. You Cannot put fiberglass mat or resin over metal with, or without Epoxy coating. It will pop off.
I have seen guys install fiberglass hood scoops on a metal hood, and it NEVER works. Please let us know what you are trying to accomplish and someone here will have a solution that will work.
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Old 09-06-2019, 06:59 AM
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Aaron, I don't know the answer to your question but Southern Polyurethanes (SPI) is a smaller paint company that is outstandingly focused on customer service. They have a forum on their website that is very active and this question would be perfect for them. The forums are broken down by subject and there's even one for fiberglass and plastic. You might want to try posting this question there.

Fiberglass & Plastics | Southern Polyurethanes Forum
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Old 09-06-2019, 08:58 AM
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As said, fiberglass mat and resin doesn't stay attached to metal very long. Using epoxy resin such as West Systems might do better but if you have rusted/ perforated metal welding in new metal is the better way. A lot of repair type resins contain wax so they cure properly. Laminating resins are better for layups but they need a topcoat to cure properly. Epoxy resins have the best adhesion but they need prep between layups.
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Old 09-06-2019, 02:18 PM
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Not sure why your putting glass down on an interior floor.

Weld in panels, grind them down, then lay down matt, or undercoating. If you want to change something it is easy enough to cut out later.

If you want a exposed area such a hump you can simply undercoat the high traffic areas. Or install an aluminium in place of steel by panel bolding(permanent)or rivets(temporary) to a recessed area so the aluminum is flush.
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Old 09-10-2019, 07:38 AM
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I did a fiberglass patch on the floor of my Rambler. The car was all together and I just figured I would do a little test to see how it would work. I spot blasted the metal and laid fiberglass mat over it. I then brushed epoxy primer on over that. I drove the car for 7-8 years every single day after that, it never saw a garage once, and it lasted fine. I would check on it every year when I did a brake check and adjustment being the master cyl was right there, I had to pull up the carpet to get to it. And that fiberglass looked like the day I did it every year.

I have to believe that if you sand the epoxy primer the fiberglass would adhere to it. The bummer is with pitted metal the epoxy can't all be sanded, I don't know, post that question on the SPI forum and see.

Brian
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