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post #1 of (permalink) Old 08-03-2003, 08:44 PM Thread Starter
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Fiberglass release agents

I've done some patch work in Fiberglass in the past, mostly flat body panels and rebuilt interior floors. This project may involve styrofoam and masonite. What's a good release agent and what are you guys using to seal the styrofoam with to keep the resin from melting it? I'm going to build a hard bikini-type top and a dash for my CJ.
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post #2 of (permalink) Old 08-03-2003, 09:46 PM
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Re: Fiberglass release agents

I don't know of anything that will keep the foam from melting however there is epoxy that doesn't attack the foam and foams that are not attacked by the other resins. If the resin says poly anywhere in it, it'll probably melt the white bead foam.

Look in the Yellow Pages for plastics, you should find somebody that sells the release agent especially where you live. The stuff I bought was green and came in a quart bottle (not a national brand, packaged and maybe mixed locally). I used maybe a third of it or less to make a fiberglass divider panel for my halftop using a metal one from a scrambler for a mold. I've used wax, WD40 and Pam for small projects, but for something that size I'd definitely use the right stuff.

From experience, I'd also advise that you use woven cloth on the outer surface and then you can use the mat on the inside. Also, it works better to pour the resin first and then push the 'glass into it. If you try laying the 'glass out first and then try to get the resin to wick through, you will probably wind up with dry spots.
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post #3 of (permalink) Old 08-03-2003, 10:05 PM Thread Starter
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Re: Fiberglass release agents

Well, I did a search and came up with several links. I liked this one, This was about "the lost foam method". This seems to be the easiest method for the dash. This guy uses Elmer's diluted with water. The top will definitely require a release, maybe a sheet of plastic sheeting. Thanks for the tips CJ7Taz, every little bit helps.
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post #4 of (permalink) Old 08-04-2003, 08:17 AM
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Re: Fiberglass release agents

I've had great results with Dawn dishwashing liquid, diluted with water about 3 water to one Dawn. Brush or spray it on and let the water evaporate.
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post #5 of (permalink) Old 08-04-2003, 08:20 AM
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Re: Fiberglass release agents

You wnat a release agent for Fiberglass? Wax. I'm not tlaking Candle wax, which could be used, but rather a softer wax that you can smeer.... Unfortunateky I can't for the life of me think of the name.... [img]images/graemlins/chair.gif[/img] Use to do Fiberglass sculpture and this is what we used to use.
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