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Old 07-14-2005, 08:16 PM
jmi jmi is offline
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repriming over existing primer

I started my project 10 plus years ago and had body work done and the entire truck primered. over the course of the build I have done modifications such as shaved door handles and installed a fuel door and just used spray can primer to protect the area of the work done, now i want to reprime the truck until i can afford to put the final paint job on it. I have been told that i should rough up the old primer with 180 grit paper then i will be able to put a fresh coat of primer on the truck. The truck has been garaged all these years while i worked on it so the original primer is not weather beaten. Is 180 grit the right grade paper to accomplish this task. Any help regarding this is appreciated.

Thanks JmI

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Old 07-14-2005, 08:21 PM
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What kind of primer is on the truck now?
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Old 07-15-2005, 01:59 PM
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Not knowing what is on the truck now and the fact that you have used spray can primer on it, I would recommend taking it it all off. The biggest reason I say this is just to make sure the metal underneath isn't rusting. If the truck was sprayed with a laquer type primer, moisture will permeate to the metal through the porous primer. Taking it all off is the only way to make sure you aren't painting over rust when you get to the topcoat.
Besides, this is a good blocking excersize and it will help to get the panels flat. Once you have the metal ready shoot an epoxy primer to seal up the body panels and then move on to a good primer/surfacer to finish up the blocking.
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Old 07-15-2005, 02:27 PM
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I agree with astroracer.
Take whats on there back off, and if you can shoot it with some etching primer. Something else to consider when working on projects as the different kinds of rattle can primer you use. I found this out the hardway. When using primer try to stay with the same brand, otherwise your primer will "lift" and you have to re-sand again.
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Old 07-15-2005, 04:09 PM
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Take all of the rattle can primer off and don't ever bother to use any again IMO. Rattle cans are for used car type work if you don't have a conscience. If there is lacquer primer I'd also strip that off as well. As already suggested apply some epoxy primer over your bare metal then a primer surfacer on top of that. Lacquer products just don't hold up, all aerosol products are a 1K also- junk IMO.

Most people put a whole lot of time in these projects, there's no sense in wasting all of your time because of product failure.
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