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Old 07-05-2005, 09:59 PM
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Fiberglass interior using foam.....

I get a regular news letter from a hotrod group and in it I see this LINK Looking closely I notice that the foam being used is a spray type very similar to the project that I did. Well for that I used the insulation foam and this looks just like it. Can someone let me know exactly what it is they are using. I was planning on using the floral foam when I start mine, but this looks much easier. If I could spray it up then it would save a lot of time.
Plus what did they use to protect the car from having that stuff stick to it? I would expect it to be like glue. Thanks

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Old 07-05-2005, 11:34 PM
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Thats the same spry foam insullation they use in houses.

try any home improvement store. Glue releice might help in getting it to not stick. But I would test it all first.
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Old 07-05-2005, 11:49 PM
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Looked kinda like duct tape was used..anyway I would want to mask off the areas I did not want the foam to stick to before I sprayed it..that stuff is like a glue and could be a hard task to get off of an area where it was not wanted..

I have tried most all of it and now do what is known to work..
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Old 07-06-2005, 06:09 AM
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I think the foam you are seeing is polyurethane. Floral foam is usually polystyrene and depending on if you use polyester resin or epoxy it may or may not work.

Polyester resin (fiberglass) will dissolve polystyrene foam, epoxy resin will not.

Polyurethane foam will work with either polyester resin or epoxy resin.

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Old 07-09-2005, 08:29 AM
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HILTI makes a foam that expands a whole lot and it hardens real good, which im thinking thats what you need. as far as having it not stick, im sure WD40 or duct tape would work good.
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Old 07-09-2005, 08:44 PM
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release agent

We use a high quality paste floor wax (Johnson wax) as a release agent at the model shop for pulling fiberglass splash molds from clay models.

Last edited by creativeinteriors; 07-09-2005 at 09:28 PM.
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Old 07-11-2005, 05:14 PM
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mixable foams
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Old 07-14-2005, 10:47 PM
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I've used this stuff before. It looks like the pour in place expanding foam that I used on my boat when rebuilding it. It's used for floatation, filling voids and is also structural when filled in the hull cavities.
If you goto a fiberglass supplier you can buy it. It's a two part mix.
There are also guys that spray it commercially, used in boats and insulation for hot tubs etc.
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Old 07-28-2005, 11:23 PM
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Guys, I have worked with literally tons of this stuff, and yes it is a polyurethane. We inject and mold about 14000 cubic feet per day at work. There is a special mold release out there, but when we get hard up, we use spray silicone first and then Johnson & Johnson paste wax. With paste wax alone, sometimes it will still stick due to heat the foam releases during cure. Anything that acts as a sacrificial barrier would work, even thin plastic, plastic tape etc. A tip here, if you want to cut this stuff, butcher knife works good and on large pieces, a carpenter saw. For shaping, try a high speed grinder / sander, or even a sanding block with 60 - 80 grit. You can mold the heck out of this stuff. By the way, the house type foam and the boat flotation foam are very different critters chemically & some properties. All about 2-4lb per cubic foot foam though.
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