Problems with epoxy bubbling

Can anyone suggest what causes dime-sized bubbling when coating the bottom of a 10 year old cedar-strip canoe with West System epoxy? And maybe a fix for the problem? I removed the old epoxy, which had delaminated. This should have given me a clue that there was a problem.... SOMETHING is reacting and off-gassing, but I have not a clue what is going on.....

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