It could be from stress. If it is and it's completely relieved itself the eternabond will hold without a problem. If it continues to crack you should take it to a place that's well versed in fiberglass. Most marine repair places are used to fixing these kinds of problems. They'll most likely gouge and end drill the cracks before repairing them.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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