I would go for Sika-flex deggsy, it sticks like shit to a blanket and dries like hard rubber and will take any amount of flex.
If you put it on really thick it takes between one and two days to cure properly, but well worth the wait.
I actually Sika-flexed the bolts to the inside of my stainless bumpers, and there is no way they will ever come off.
But use the marine version, which is the best.
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