Fiberglassing over styrofoam..how can this be done? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-31-2009, 09:21 PM
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When you lay fiberglass over polyestirene, how do you avoid the resin eating up the polyestirene?

any solvent will make it dissapear in no time.

Augusto.

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Last edited by powerrodsmike; 08-31-2009 at 09:31 PM. Reason: Other.
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Old 08-31-2009, 09:26 PM
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Tape off the polystyrene, (styrofoam), or spray a bunch of coats of poly vinyl alcohol over it..you need to seal the surface. Shellac would probably work too, then wax the shellaced surface.

Epoxy resin does not eat styrofoam.

The proper foam to use for glassing over is urethane.
I'm splitting this question out to the exterior forum.

Later, mikey
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Old 09-01-2009, 07:31 AM
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Just to add to Mikey's suggestions, if your pieces are not intended to be absolute replicas of something original, you can also spread on a thin layer of plaster of paris of even drywall compound. Either of these options are fairly easy to sand so you can get a very smooth finish should you need it. If you put the compound on thick enough you can also work in a bit of detail (such as belt lines or accent lines). Mikey's alternatives have the advantage of not needing to be sanded or smoothed so if your application allows you to glass right over the rough finish of the styrofoam, those would be the quicker and better choice.
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Old 09-01-2009, 07:52 AM
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The easiest thing to do is cover the foam with plastic packaging tape. Cover it completely so no glass resin can touch any part of the foam or it will dissolve it. Once it has cured just pop the fiberglass off the foam and your good to go. That is exactly how I made my console. Epoxy resin is too expensive and polyurethane foam is not as easy to obtain as polystyrene foam is.


Vince

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Old 09-01-2009, 05:47 PM
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In the past I have snuck in the kitchen and "borrowed" the wife's saran wrap. I use it to cover items to protect them and then coat it with fiberglass to make a quick mold.
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Old 09-01-2009, 06:18 PM
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All god ideas..Some of the blue foam insulation from the lumberyard is urethane and will take the resin..If I recall correctly..test a piece first before proceeding..

Sam
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Old 09-01-2009, 06:31 PM
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Quote:
Originally Posted by OneMoreTime
All god ideas..Some of the blue foam insulation from the lumberyard is urethane and will take the resin..If I recall correctly..test a piece first before proceeding..

Sam
Sam, yes it is, but what I do not like about it, it is too grainy. When you sand it it goes everywhere and makes a real mess.

Vince
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Old 09-01-2009, 07:53 PM
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The green foam from hobby Lobby store's, Work's good.They use it to put in the bottom of flower pots...
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Old 09-01-2009, 07:56 PM
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Vince,
Is there anything about fiberglass that is not messy? I can do it and appreciate good results with that material but then I would just as soon let someone else do it..

Sam
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Old 09-01-2009, 08:45 PM
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I have used it before, but I have had a shop vac running with the hose right under where I'm shaping it. I actually did use some of it to form part of my console.

Vince
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Old 09-02-2009, 12:41 AM
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Latex House Paint

Hey Friend, Although I've never tryed it, a friend once told me you could simply paint the styrofoam with latex wall paint, a couple of good coats and the polyester resin could not get to it. Test it first, maybe its worth a try. olnolan
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Old 09-02-2009, 06:59 AM
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Originally Posted by OLNOLAN
Hey Friend, Although I've never tryed it, a friend once told me you could simply paint the styrofoam with latex wall paint, a couple of good coats and the polyester resin could not get to it. Test it first, maybe its worth a try. olnolan
That sound feasible if you could get the latex thick enough to seal off.

Vince
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Old 09-02-2009, 07:12 AM
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Augusto,


I recently built a fiberglass trans tunnel using the "pink" polystyrene foam as a plug. I have entered it into my project journal here:

http://www.hotrodders.com/forum/jour...age=5&reverse=

After I finished the shape of the plug, most of the foam was skimmed over with body filler and sanded and then given a coat of epoxy resin to seal everything. Although epoxy resin is more expensive than other types of resin, I used less than 2 ounces of resin to cover the entire mold. If you have some epoxy on hand, and the part you are making is not too big, I see no reason not to use epoxy.
After the epoxy coat, I coated the plug with a few coats of mold release wax followed by the polyvinyl alcohol.

Hope this helps,
Steve
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Old 09-02-2009, 10:07 AM
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Steve, excellent post, really enjoyed your documentation in your journal. You need to incorporate that into an article we can post in the body forum.

Vince
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Old 09-03-2009, 07:24 AM
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Thanks for the compliments, Vince. I would be glad to make an article outlining the procedure I used. Just let me know what format you would like it in. Should I make it a new post in the forum, or make a wiki article?

Steve
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