timeout! that urethane-in-a-can needs to be used with extreme caution. make darn sure you have room for the expansion, and fill s-l-o-w-l-y, cause if you just firehose the stuff in there, and the second hole can't keep up with the exhaust, so to speak, the newly drying/expanding/becoming-tacky foam will grab where it touches, say, the inside of the door, and keep right on expanding. It can **easily** pop the skin off the frame of the door.
I have seen it explode the end of a kayak, wrapped in fiberglass. it *WILL* expand. Somewhere. Trust me.
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Be Just and Fear Not.
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