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Old 02-25-2015, 06:57 PM
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Default rigid polyurethane foam

who has used this product. for what purpose. and where is the cheapest place to buy it
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Old 02-25-2015, 07:55 PM
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Home depot/Lowes:
Not really cheap, and if this is the same stuff, its used for house insulation, and or CNC machines.

Comes in blue and pink typically. About 30 to 35 dollars for a 2" x 4' x 8' sheet.

Owens Corning FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Scored Squared Edge Insulation Sheathing-45W - The Home Depot

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Old 02-26-2015, 11:14 AM
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Keep in mind that any "polystyrene" foam will "melt" under the resin typically used in fiberglass work. This is because the typical resin is styrene based and reacts with polystyrene. If you use epoxy resin, it should work with polystyrene foam - i think. Or, you could use urethane foam board (usually the yellowish foil-faced stuff) with typical styrene resin.

edit: I apparently didn't drink enough coffee this morning...

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Old 02-26-2015, 12:44 PM
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The Man is talking "polyurethane" foam, NOT polystyrene. Polyurethane foam is excellent for making plugs for fiberglass parts, etc. It will not melt when glassed w/fiberglass resin. Check some of the home supply stores or where a/c-heating units are sold. Here, in east coast S.C. a 1"X4'X8' sheet is under $20.00. You could keep an eye out for local schools re-roofing old schools. I lucked up on 180 sheets, 3" thick just for hauling it off & the contractor didn't have to pay landfill fees. Foam on. Rick
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Old 02-26-2015, 03:04 PM
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Urethane foam also comes in different weights, depending on what you're doing. The home store stuff is light - maybe 2#'s per square foot. I have stuff here up to 30#'s a square foot.. not cheap, though.

Rick.. I need to have your luck!
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Old 02-26-2015, 11:33 PM
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Guys, what I'm talking about is liquid. You mix two parts to activate it, then it expands.
The foam is rigid when it hardens. It can be sanded and shaped to make molds for fiberglass.
When I was building S.C.C.A race car bodies we would use it to make a buck, then make the part in glass.
then if we were happy with the new fiberglass part we would make a mold of that part so we could mass produce.

Poly urethane foam comes in 1/2 lb 2 lb 4 lb 6 and 8 lb densities .
The denser the foam the less cubic feet of foam it produces.
Thus the less dense it is, it has more and larger bubbles( air pockets) in it and produces more cubic feet.

In race cars section of the body is filled with this foam because is also impact foam and very light as well.

I can also be used in boats because it floats.

I figured someone here has used it for fiberglass here and had a supplier.

My local supplier in Kansas City has closed his business.
Now I am paying 50.00 for a gallon that produces 6 cubic feet at the most.

I was paying 50.00 for five gallons of it
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Old 02-27-2015, 08:28 AM
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A quick Google search will reveal a number of suppliers, but the shipping is what is going to kill for larger quantities.

6 lb Polyurethane Mix & Pour Foam in stock ship same day | Fibre Glast

And you need to tell us exactly what you're looking for first, Dale!
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Old 02-27-2015, 01:10 PM
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Doesn't Brett use the 2 part pour and mix stuff? I think he gets it from Tap Plastics

http://www.tapplastics.com/product/r...ethane_foam/79
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Old 02-27-2015, 10:37 PM
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sorry I thought with everybody here that works with fiberglass would know what i was talking about
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Old 06-23-2020, 12:47 PM
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Default 2 part rigid urethane foam

Available at Home Depot as a material for setting fence posts. For under $15 a bag, you get both part A and B, that when combined begins to foam in 10 seconds. Tried to load pictures but not successful. See my build journal #309 for more info.
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