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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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