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Old 12-18-2003, 12:07 PM
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Old Primer - New Primer

I have been massaging the body of my Nova project for some time now, and when I've had to grind, sand or otherwise prep the metal I usually hit that area with a decent quality rattle can primer when I get the area repaired. My question is - When it comes time to prime the whole car, can I use a high quality epoxy primer OVER those existing worked over areas without lifting that old primer? The next question would be - what would you paint experts do in my situation to manage the repair processes needed in those areas? Thanks!

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Old 12-18-2003, 12:09 PM
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I am a troll. Please don't pay attention to anything I post.

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Old 12-18-2003, 12:12 PM
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what the hell was that about? I frankly wouldn't leave the rattle can stuff on anything I cared about. Sand it down and put a good primer on her.
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Old 12-18-2003, 12:20 PM
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Old 12-18-2003, 12:36 PM
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The thing about "good" epoxy primers is yes there are so good that you can use them over anything without worry unless it has a muffler and Z rated tires.

I recomend PPG's 280/285 epoxy primer with a little acetone in it if needed to thin it. Put your first coat on mist thin and take your time . Don't buy into doing everything by the book.
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Old 12-18-2003, 12:40 PM
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Old 12-18-2003, 01:08 PM
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Stuff the ricer crap. I asked a legitimate question about body work and expected reasonable responses.
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Old 12-18-2003, 02:20 PM
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My only concern would be that most spray can primers are not sealers. That primer could be holding moisture against your metal work, moisture that could cause a lot of problems down the road. If I was going to invest in a quality paint job I would not take the chance. It should not take lone to strip the old primer spots if you're already stripping the rest of the car.
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Old 12-18-2003, 06:01 PM
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Quote:
Originally posted by nova69
Stuff the ricer crap. I asked a legitimate question about body work and expected reasonable responses.
As you can see we have a bit of a troll infestation problem... Please don't let that cloud your opinion or use of this forum.
I agree with barz51... hit the whole car with 180 grit on a board sander. Take off ALL of the rattle can stuff. Be careful not to screw up your body work though, the board sander should leave everything pretty flat. Spray a good epoxy primer/sealer over the whole car then hit that with a couple of heavy coats of primer surfacer. Block that down with 320 or 400 grit and shoot it again. One more blocking with 600 to 800 grit and you're ready for topcoat.
Mark
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Old 12-18-2003, 06:48 PM
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If the primer can soak up moisture it can wick it dry as well.


My question is - When it comes time to prime the whole car, can I use a high quality epoxy primer OVER those existing worked over areas without lifting that old primer?

YES
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Old 12-19-2003, 05:25 AM
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Quote:
Originally posted by milo
If the primer can soak up moisture it can wick it dry as well.

YES
NO! ... ANY moisture that has penetrated the rattle can primer is going to start to rust the bare metal underneath and this compromises the bond. Whether it has "wicked dry" or not, I do not recommend leaving the rattle can primer on the car. Take it off, give yourself some peace of mind in knowing all of your hard work isn't going to lift or peel and do it right the first time... Saves time, saves money...
Mark
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Old 12-19-2003, 11:20 AM
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Most of the rattle can primers are lacquer based and will skin off when eproxy primer is sprayed over them, peeling back to the bare metal. Do it right the first time, take your body down to bare and build from there. (Kind of rhymes too!)
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Old 12-19-2003, 11:59 AM
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You should never use rattle can paint or primer of any kind on a car.

Troy
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Old 12-19-2003, 03:59 PM
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OPINIONS

Well, there you have it Nova. Lots of ideas and a little troll to go with it. Check the article in CUSTOMCLASSICTRUCKS.COM They painted the inside of their truck with RATTLE CANS. Looked pretty good. Like most things, you need to ask YOURSELF a few questions. AM I LEARNING? DO I CARE? CAN I REDO IT? (IN A FEW YEARS) It is always good to do it right the first time, but you may not have that much time. I once spent a weekend sanding down a car. Told myself that I wanted to drive by Tuesday. Sunday night I shot the whole car with primer from cans. Neighbor had a bright idea and we covered it with clear. Raced that car for two years before I got back to doing a real job. Sure was fun.

hr41pearl
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Old 12-19-2003, 05:33 PM
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Thanks for the information. It appears most agree that the lacquer based stuff has to go away. No risk taking here. How can we throw a net over the troll?
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