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I just got new fenders and they have good e-coating on them (did the lacquer thinner test). I plan on lightly sanding the outer part apply epoxy, 2K, block then top coat. My question is do I need to do anything on the inside? There are no scratches on the coating, should I sand and epoxy or will I be OK just applying some rust fighter coating.
 

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blacklabzeke said:
I just got new fenders and they have good e-coating on them (did the lacquer thinner test). I plan on lightly sanding the outer part apply epoxy, 2K, block then top coat. My question is do I need to do anything on the inside? There are no scratches on the coating, should I sand and epoxy or will I be OK just applying some rust fighter coating.
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Just depends on what the fender is for, if its a 2004 Pontiac (just an example)
Install it and forget about it.

If its a street rod or collector car hand scuff it with 180-320 or so and apply two coats of a good epoxy.

Most of the e-coats I'm testing from new sheet metal is coming in with 260-375 hours under the salt spray test half as good as 10 years ago but still a respectable coating for an everyday car.
 
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