3m is good but the SEM products work just as well & when i did my endura repair the SEM was much cheaper priced & available in 2 smaller tubes vs the gun needed for the 3M stuff, not sure if 3m comes in smaller tubes but the paint shop i was using didnt have it, only the bigger mixing gun.
SEM flex weld worked excellent at filling a 1"x1" gouge & many smaller hairline cracks on the top that these noses get. sands easily & smooth. i used an epoxy primer also but not SPI. once filled, vibrations & pot holes etc will not make it come loose, its permanent.
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