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the chip on the 1/4 that has surface rust, the right way would be to grind using a 3m black coated wheel these wheels dont warp the metal its just is just to clean and prep the metal, if the metal has not pitted due to rust, then we just feather the area with 180 then 240, then we apply the primer
ppg`s ncp 271 primer is corrosin resistant and water proof and is oem recomended for shops to use, its the same stuff on my alero right now, and then you know remove everything, if we have to blend the door for blending color, but thats not what ya need or want to do
now if its just a small chip that is starting to rust out, take the 180 you bought for the wiper arms, and lightly sand the chip, go to the local hobby store and buy some small brushes<very cheap
now take the por-15 and touch up the rust, por-15 has to dry 24hours for paint to be applied over, trust me on that i found out the hard way when i rushed this product and watched base coat just fish eye right off
if you can find the gm touch up paint in the touch up bottle, just use that and touch up the affected area, after 24 hours lightly wet sand with 1500, then touch up some more, if it looks decent then your good
as long as the metal has a corrosion resistant product like por-15, or etch primer, or a sealer it wont rust, or it will last a year or two
and the last repsonse..........
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