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Re: Removing rust spots on primer
[Re: xyxxjx]
#2076193
05/18/16 11:33 PM
05/18/16 11:33 PM
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Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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Are you sure the rust is from underneath? Hmmm, let's See ... under the primer you have metal. On top of the primer you have ... nothing. Yeah, I`m pretty sure its from underneath !! I sanded down a small area that had rust on the primer. The rust disappears half way through the primer, there's no rust on the metal. But will sand down anyway to be sure. Primer is pretty thin, at least it normally is. You say it disappeared, the only other way rust would be on top of the primer is if your car was subjected to a metal dusting of some sort . I would review the Eastwood web site for chemical rust removers . They have a lot of tips also . Do not grind the primer off, Use a DA sander with 80-100 grit paper, you do not want to damage the metal, just remove the primer, then the rust.
it's ok to butt heads, just don't do it with a butthead
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Re: Removing rust spots on primer
[Re: rowin4]
#2076845
05/19/16 11:52 PM
05/19/16 11:52 PM
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Joined: Feb 2013
Posts: 206
Los Angeles CA
xyxxjx
OP
enthusiast
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OP
enthusiast
Joined: Feb 2013
Posts: 206
Los Angeles CA
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Are you sure the rust is from underneath? Hmmm, let's See ... under the primer you have metal. On top of the primer you have ... nothing. Yeah, I`m pretty sure its from underneath !! I sanded down a small area that had rust on the primer. The rust disappears half way through the primer, there's no rust on the metal. But will sand down anyway to be sure. Primer is pretty thin, at least it normally is. You say it disappeared, the only other way rust would be on top of the primer is if your car was subjected to a metal dusting of some sort . I would review the Eastwood web site for chemical rust removers . They have a lot of tips also . Do not grind the primer off, Use a DA sander with 80-100 grit paper, you do not want to damage the metal, just remove the primer, then the rust. Yes I think it's metal dust, but I'll sand down anyway to make sure. Will check out the eastwood stuff.
1973 Dodge Charger SE 400 automatic transmission. Curb weight: 3800 lbs. All stock so far.
Goal: Reliable everday driveable warmed up 400 as close to 400hp as possible, then a 470 stroker if need be.
Don't protect a feminist when the collapse comes!
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Re: Removing rust spots on primer
[Re: xyxxjx]
#2076846
05/19/16 11:58 PM
05/19/16 11:58 PM
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Joined: Jan 2007
Posts: 7,664
IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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One pass would be one coat. Usually best to overlap the passes about 50%. The first pass should cover (barely) the metal and the second pass about the same thickness should cover completely. The primer needs a top coat of some sort to last. You have several choices after applying the rusty metal primer. If you plan to replace the vinyl top shortly, best to apply some Rustoleum enamel (finish paint) in a color similar to your car... then cover it up later with vinyl. If you want to finish paint the top and no vinyl, then a smooth surface would improve appearance. In that case, wait 1/2 hour and apply the auto primer. Wait a couple of days, sand with 220 to smooth and apply the finish paint. With painting, more coats of primer + more sanding makes it smoother. Several coats of auto primer + sanding may be needed to get it completely smooth if you want a painted surface. For vinyl, get it protected with primer and finish paint and lay on the vinyl.
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Re: Removing rust spots on primer
[Re: ahy]
#2077522
05/21/16 02:57 AM
05/21/16 02:57 AM
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Joined: Feb 2013
Posts: 206
Los Angeles CA
xyxxjx
OP
enthusiast
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OP
enthusiast
Joined: Feb 2013
Posts: 206
Los Angeles CA
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I One pass would be one coat. Usually best to overlap the passes about 50%. The first pass should cover (barely) the metal and the second pass about the same thickness should cover completely. The primer needs a top coat of some sort to last. You have several choices after applying the rusty metal primer. If you plan to replace the vinyl top shortly, best to apply some Rustoleum enamel (finish paint) in a color similar to your car... then cover it up later with vinyl. If you want to finish paint the top and no vinyl, then a smooth surface would improve appearance. In that case, wait 1/2 hour and apply the auto primer. Wait a couple of days, sand with 220 to smooth and apply the finish paint. With painting, more coats of primer + more sanding makes it smoother. Several coats of auto primer + sanding may be needed to get it completely smooth if you want a painted surface. For vinyl, get it protected with primer and finish paint and lay on the vinyl. Great, I think I have enough information to go on now.
1973 Dodge Charger SE 400 automatic transmission. Curb weight: 3800 lbs. All stock so far.
Goal: Reliable everday driveable warmed up 400 as close to 400hp as possible, then a 470 stroker if need be.
Don't protect a feminist when the collapse comes!
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