Primer duration

Fiberglass, body panels, valences. Also interior pieces like seats, dashes, etc
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Primer duration

Postby Court M3 » Sun Jun 14, 2009 7:19 pm

Just wondering how long can you leave a car in primer before painting? Going to be fixing a couple of rust spots before painting the car(not anytime soon). Want to fix the rust before it spreads.
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Re: Primer duration

Postby Yoshi » Sun Jun 14, 2009 7:34 pm

self sealing primer is fine indefinitely. If its not sealed, its fine as long as water doesn't get on it. Primer will actually suck up and hold water and cause rusting even after you paint.
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Re: Primer duration

Postby M20_fever » Sun Jun 14, 2009 10:02 pm

You should hit all the primer spots with primer sealer if your not going to paint it anytime soon.
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Re: Primer duration

Postby ten2doyle102 » Mon Jun 15, 2009 1:13 pm

Good question! I was wondering the same thing about the fenders that I have. They're just primered but they have been sitting around for a while so yeah.

On a side note, should they be resprayed on that primer, or would it be better to do another coat of primer and then the base coat when the primer is still tacky? Spray paint can always say that you should lay your primer, then 10-15 min later hit it with your base coat....is that true?
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Re: Primer duration

Postby Yoshi » Mon Jun 15, 2009 3:30 pm

adhesion will be better if you do it all in one sitting. Realistically, it should go:

Metal
Self etching primer
Primer
Base
Clear

all in one sitting.

You can skip the self etching primer if the metal still has some on it. Without the etching primer on bare metal though, shit flakes off easy.
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Re: Primer duration

Postby ten2doyle102 » Mon Jun 15, 2009 3:39 pm

Hmm.. ok. I guess I can talk to the guys that will be painting them. I was going to do all the prep on them and let them spray the fenders.
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Re: Primer duration

Postby Lames » Tue Jun 16, 2009 1:44 am

Yoshi you forgot primer sealer after primer and before base. That way the base color and the primer don't bleed into one another. Also high build helps a bit if you want to add that before primer and after self etching.

But ya primer soaks up water, it has more pores. Try not to leave straight primer exposed to rain etc.
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Re: Primer duration

Postby Yoshi » Tue Jun 16, 2009 2:08 am

I always sand off sealer before I put on a base coat. I prefer to have the primer suck up the base color, thats why you pick a good color primer :). Sealer is almost like clear coat, it makes stuff flake off easier.
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Re: Primer duration

Postby Lames » Tue Jun 16, 2009 2:33 am

hmmmm, I hope it doesn't make this guys bumper flake up
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Re: Primer duration

Postby Yoshi » Tue Jun 16, 2009 2:35 am

sealer is really only meant to seal primer while you do other things. Thats why they dont make etching primer sealer. It makes no sense. You are supposed to take off the sealer or not even use it unless the primer is going to sit.
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Re: Primer duration

Postby Lames » Tue Jun 16, 2009 2:36 am

I thought it helps the primer and the base need bleed into one another effecting the color. Granted I'm using black primer with black base coat but ya. I guess it matter more if I was using say a red oxide primer with a brown base if I was going for an exact color match.
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Re: Primer duration

Postby Yoshi » Tue Jun 16, 2009 2:38 am

nope. "The more you know *corny music*".

Think you are "SEALING" the primer away from everything else.
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Re: Primer duration

Postby M20_fever » Tue Jun 16, 2009 3:37 am

Different primer sealers have different properties. Some sealers are excellent ground coat colors, and don't do much else. Some have excellent metal adhesion properties, and are great for bare metal application. Sealers are generally non-sanding, meaning just that- they aren't intended to be sanded. In a given time frame, they can be primer ed or painted right over. Sealers can sometimes provide somewhat of a barrier between the old finish, and the new finish. Sealers have little ability to fill sand scratches or voids of any sort. They tend to be pretty thin. Primer surfacers are for filling small imperfections, like sand scratches in bondo, or filling the cove left behind when you sand out a stone chip or scratch. Primer surfacers always need sanded before topcoating. They seldom have bare metal adhesion properties, and need a sealer or metal etching primer applied before applying primer surfacer. Primer surfacer is heavy and thick, it contains talc to give it body. This is why when it's dry sanded, the dust is so fine and powdery. Bil


http://en.allexperts.com/q/Auto-body-repair-2036/Primer-vs-sealer.htm

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Re: Primer duration

Postby Yoshi » Tue Jun 16, 2009 1:04 pm

ok so I was thinking primer surfacer and he was talking about surface sealer.
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Re: Primer duration

Postby Lames » Tue Jun 16, 2009 1:45 pm

Ya that stuff. I thought it was weird because I used red oxide high build primer, then black primer, then the sealer primer which was white. I was like ahh WTF it's the wrong color but I guess that is the color it is supposed to be?
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