I fixed a spot on my door w/ sand and paint about a year ago, still no trouble... just use the proper primer, clean, and make sure you got it all. however the spot on my rear wheel well has some metal all the way eaten though, all I did was slow it down it down a bit 
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3rd alero- 02 GX 2.2 5sp coupe. drove for 3 years 55,000 miles. Sold for a kids first car, and missed
01 Intrigue GX
2016 Chevy SS, Jet Black
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