JB Plastic weld WILL adhere forever on those fender skirts.. I have repaired both of mine where some of the screw hole areas have cracked.. They have never cracked again..
JB epoxy will not work well... be sure to get the Plastic weld.. It comes in a tan color also that will be a close match to your fender color..
Stop drill the crack and rough up the backside with fine sandpaper.. I used some light gauge metal on the back of my repairs to act as a stiffener over the crack area.
Also when I remounted the fender skirts I placed rubber washers behind the plastic skirt to give the skirt the ability to absorbs some of the vibration.. Any hardware store has various size rubber washers at a low price
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