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Old 08-27-2003, 10:51 AM
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rust under primer

I am finally getting around to painting my mustang but I have run into a problem. Since it had two layers of paint on the roof already I decided to strip it and what I found is tiny rust pits everywhere! The first time I painted it I sanded all the way to bare metal so I know the pits were not there then. At that time I just primed the bare metal with lacquer primer with no metal prep other than to wipe it down with enamel thinner,is this what caused my problem? I now know that this is not the right way to do this but I am still faced with what to do next. The rust did not show in the paint but is very evident under the primer and will not sand out. I want very much to get this right this time and any advice will be MUCH appreciated!

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Old 08-27-2003, 12:26 PM
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chemically treat it & then primer it.........joe
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Old 08-27-2003, 06:13 PM
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If you let the car set for any long periods with no topcoat during the first repaint session, moisture will penetrate the primer and rust the base, primer is porous and will hold water.
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Old 08-27-2003, 06:57 PM
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my last two paint jobs after stripped to bare metal,etching primer,then urethane fill primer,acrylic urethane paint,then clear
the coupe is on 3rd year holding up good,by no means a pro, the way I was told what to do. hope this helps some,also go to knowledge base HK put alot of painting tips in
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Old 08-27-2003, 07:13 PM
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I guess what I really need to know is what to do about the rust pits. I have searched and found much info on dealing with rust but little that deals with tiny pits that will not sand out. Do I treat with metal prep(phosphoric acid maybe)and then just prime? Or should I completely remove all traces of rust somehow. I had the same problem on an old bronco a while back and I just wiped it with metal prep and then primed and so far it is ok but that was only a few months ago. The bronco was not that important but this mustang is and I really do need to get it right. BTW thanks for the replys
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Old 08-27-2003, 07:34 PM
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I use these 3M paint and rust stripper wheels you can get at any hardware store on a die grinder it maybe alittle slow but feels they get down and cleans the area good in the pitted areas I use metal cleaner,if heavy pitted consider cutting out and replace with new steel,after that with wipe good with paint prep then primer and paint process following directions of product you use.Trying to be some help.
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