Fiberglass resin ?

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Fiberglass resin ?

Postby rustytoolss » Thu Jun 07, 2018 6:38 pm

I made some fake fenders out of XPS 2" foam. Covering them in PMF might not look very good. To many compound curves. Would coating the XPS foam with fiberglass resin work to make them more ridged ?
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Re: Fiberglass resin ?

Postby Pmullen503 » Thu Jun 07, 2018 7:02 pm

Epoxy resin, polyester will melt the foam.
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Re: Fiberglass resin ?

Postby rustytoolss » Thu Jun 07, 2018 9:05 pm

is epoxy resin, whats used for auto body work ?
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Re: Fiberglass resin ?

Postby KTM_Guy » Thu Jun 07, 2018 9:13 pm

I have not heard of epoxy used in auto body. Look up West System epoxy it's used for boat building , and airplanes. I used it for my tear.
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Re: Fiberglass resin ?

Postby tony.latham » Thu Jun 07, 2018 9:51 pm

I've done a lot of glassing in my day.

Yes, polyester resin will dissolve your foam. I quit using the stuff a long time ago. Epoxy resin is much better.

But here's my opinion: Resin over foam isn't going to work. Fiberglassing them will. But I'm shooting in the dark without a picture of what you have.

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Re: Fiberglass resin ?

Postby Pmullen503 » Fri Jun 08, 2018 5:22 am

Epoxy resin alone would be a waste. You'll want several layers of fiberglass cloth.
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Re: Fiberglass resin ?

Postby mallymal » Sat Jun 09, 2018 11:31 am

Isn’t that how surfboards used to be made? Shaped foam with cloth and resin to add a skin....

Maybe look for surf forums...... :thumbsup:
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Re: Fiberglass resin ?

Postby tony.latham » Sat Jun 09, 2018 5:40 pm

mallymal wrote:Isn’t that how surfboards used to be made? Shaped foam with cloth and resin to add a skin....

Maybe look for surf forums...... :thumbsup:


Yes. With epoxy resin in the fiberglass. I assume they still are but maybe those days are gone.

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Re: Fiberglass resin ?

Postby noseoil » Sun Jun 10, 2018 8:20 am

Best way would be to make the fender the "plug" for a mold, then pull a mold from the plug & lay-up the fender out of glass as the finished part from the mold. Sounds like a lot of work, but it would be a good lightweight fender that's strong & repeatable. I know, too much labor & cost of materials...
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