Re: The Plasti-Dip craze!
for the fender, you have two choices. 1st would be to buy a new/used fender without a dent, then repaint. 2nd would be to remove yours, try to knock the dent back out to where it's supposed to be, then a skim coat of filler, then paint.
if it were me, i would find a new fender. with the dent going across a body line/flare, it's gonna be more difficult to get it right. it could be fixed, but unless you know and understand how body work is done, i wouldn't try it.
Krylon Fusion is for Amateurs.