Hey man if I were you go to Autozone and save yourself some money on rustoleum or invest in a sander....I did it on my 89 GT along with some sandpaper....did the fender, gas tank, underneath the rear spoiler,etc andalso invested in some rustoleum ...as long as you sand down beyond the primer and there are no holes you should have nothing to worry about but remember to get primer on the area ASAP or the surface rust will come back....good luck

Jeff