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I have grafted a fibreglass forward half of a fender to the metal back half, the pieces joined mid wheel. Metal and glass are stepped and pop riveted,glued and glassed over, they continue to crack in the joints. Once I jacked up the car and the joint cracked. It has justed cracked in normal use I have repaired this many times and have had them pro. repaired, they still crack
 

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Both materials flex differently, there will always be cracking because you can't join the two any stronger than a rivet and glue. and as Wills 41 says, the expansion will differ. Dan
 
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