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I was concerned about gaps between the plastic skin I was repairing and the foam core. These gaps would trap air that would heat up and cause the plastic to crack again. So, I drilled holes and poured in epoxy then put weights over the skin to cement it back down. Still probably have voids but I know where I can buy more Devcon plastic weld for future cracks. I painted with a good primer and then, following some great advice from this site, sprayed with Krylon Fushion gloss white which proved to be an almost perfect match. I found Krylon Fushion in stock at my local Ace Hardware.