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Old 06-24-2010, 02:43 PM
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Primer Questions

Alright, i have a 72 F100, currently it's Primed(or what's left of the primer at least.) The old guy we bought it from said that he wanted to try painting, and i guess it didn't work out too well for him. The primer is peeling off in some places, it's cracking in others. So i was wondering a few things.

Would i be fine just lightly sanding the primer thats on there now and re-shooting it, or will i have to also sand off the old paint, and then re-prime it?

Will epoxy primer hold up to mother nature without anything over it? School dosen't start until august, and i probably won't be painting it until Jan/Feb.

If it helps any, i know the truck has been repainted once since it left the factory, and then the previous owner just shot primer over the non factory paint.

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Old 06-24-2010, 03:24 PM
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Bare metal is always your best bet for adhesion. You are asking for trouble if you spray over the existing mess.. just get a D/A with some 80 grit discs and you will be down to bare metal in no time...

You can run an epoxy primer with no paint on it for years with no problems. Just use black so it looks like one of those fancy satin/flat black paint jobs from a distance haha..
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Old 06-24-2010, 03:51 PM
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Epoxy primer is affected by sunlight, the UV rays will try and bleach the color out, but it will still retain protection. I agree with painting or priming over the old mess, that is not a good option.

Vince
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Old 06-24-2010, 06:54 PM
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hm alrighty, so say i used a black primer, whats a rough estimate on how long would it take to fade it? The truck is going to be in the sun pretty much every day.
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Old 06-24-2010, 07:58 PM
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I would venture a guess that black primer will show some chalking within a year.

Vince
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Old 06-24-2010, 08:57 PM
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Some primers can also let water through to the paint. Not that big of deal, as this just makes light surface rust, unless you drive it for years in primer in say an Alaskan winter.

What I want to know is how does someone screw up painting primer. It's as easy as it gets, and I'm not even a painter. I would have to hate to see the results had the guy sprayed clear. Regardless, you should sand or chemically strip that mess off. You'll regret it if you don't. Who knows what the guy did, maybe he coated the bare metal in WD-40 to protect it from rust before spraying primer.
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Old 06-24-2010, 09:23 PM
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Quote:
Originally Posted by 454headache
Some primers can also let water through to the paint.
This is not true with epoxy primer. ( I think we know you meant metal and not paint.)
Quote:
Originally Posted by 454headache
What I want to know is how does someone screw up painting primer. It's as easy as it gets, and I'm not even a painter.
I think there is a long list of things you can do to screw up primer. Best advice is to follow the manufacturers recommended procedures.

Last edited by roger1; 06-25-2010 at 08:25 AM.
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Old 06-25-2010, 07:59 AM
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Quote:
Originally Posted by 302 Z28
I would venture a guess that black primer will show some chalking within a year.

Vince
Alright, that works for me. Thanks for your help guys.

Quote:
Originally Posted by roger1
This is not true with epoxy primer. ( I think we know you meant metal and not paint.)
I think there long list of things you can do to screw up primer. Best advice is to follow the manufacturers recommended procedures.
ha, cool to see another person from San Angelo on here, that vette is beautiful.
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Old 06-25-2010, 09:24 AM
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sounds like it isn't a "sprayed" problem but a prep problem...who knows. I would stay away from chemical stripping. Strip with 80 grit on a da till you get nice shiny metal, clean with w&g remover and epoxy prime (per manufacturers recommendations).
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