Holly -
I never heard of these, so I am glad to know about them. Do you think it would be wise for the OP to drill a few 1/8" holes, maybe two on each side of the crack, and put an aluminum pop rivet through each hole? The rivets themselves would contribute no strength, but the extended lumpy backside of the rivet would give the moldable plastic something to grip.
One thing we all forgot to mention is that the first step in the repair should be to drill a hole through the very end of the crack. This will prevent the crack from continuing to propagate further into the rock guard.
Bill
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