Hum... that could get complicated.
First, I like your setup. The plastic ice chest inside the styrofoam ice chest, with foam in between, that's a good idea. I've used the can stuff before: it's got some quirky limitations, but otherwise works well (i.e. it won't turn solid if it's applied thicker than 2 or 3 inches away from air).
I'd consider using a silicon sealant. If you still have the lid, you should be able to fit it (with a little carving), and seal it with silicone. It might not be pretty, but it'll be safe.
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