Quote:
Originally Posted by TomO
From personal experience on the front bumper of my car using Great Stuff: I would've liked to use sheet foam since it was cured already and can be shaped just as easily as cured Great Stuff.
I waited 24 hours after applying the Great stuff so it would fully cure (as per the instructions on the can) but the foam still expanded more after I had started working on it, causing some unwanted cracking.
For my summer bumper project I'm going to use sheet foam since it won't expand on me.
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Any idea what Great Stuff will NOT stick to?
I may use the
inside surface of my old steel header panel as a female mold, spray Great Stuff in and let it expand/cure completely, then pull out. That way, I get the
exact contour of the panel, at least the portion of the panel with the contour I want.
Also, if I knew what chemical barrier (PVA is used to keep epoxy from sticking to fiberglass molds, so something like that would work) would keep Great Stuff from sticking, I could cover the outside of my fenders or whatever with it, for an instant and exact female mold* of the part, then use that for fiberglass layup to make duplicates.
So, again, any idea what Great Stuff will NOT stick to?
*Might be cheaper
if we had a good chemical barrier to apply it to the original part, take it to a foam contractor insulating a house, and have him spray it. That would take him about 5 seconds and the small amount of foam would be insignificant to his house insulation job.