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Pour Foam

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Definitely stay away from the home store "expanding foam" in a spray can.  I have used the "minimally expanding" foam in a spray can.  They are all urethanes but I think you get a more even foam with the Aeromarine product above or X-30 from Spruce.  https://www.aircraftspruce.com/catalog/cmpages/x30foam.php  I imagine those are about the same.  I'd buy whatever is cheapest.   The more thoroughly you mix the pour foam, it will harden with smaller bubbles but it's a race because it begins to foam-up pretty fast.

Actually, if I can use scraps of blue styrofoam or urethane to fill an area, it works better for me.  Mix up a little pour foam to stick them together.  A pour foam surface requires a lot of filler before glassing and it tends to keep curing a long time after use.   I have noticed depressions where it seemed to shrink under the glass.

I have read that a spray of water will speed up the cure but I haven't tried that.  Might be useful if you are using pour foam to make cowl shapes.

Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold

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