Shops, Barns, Varmints, and Trucks - How long can primer sit before paint?

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How long can primer sit before paint?

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Forum Name: Shops, Barns, Varmints, and Trucks
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=205517
Printed Date: 21 Feb 2025 at 9:26pm
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Topic: How long can primer sit before paint?

Posted By: Thad in AR.
Subject: How long can primer sit before paint?
Date Posted: 19 Feb 2025 at 7:19am

My reason for asking I’m starting work on the doors for my project truck. Once the body work is done I’ll move on to other parts. It may be a few months before they get paint.
What to prime with and how long can it sit?

Replies:

Posted By: jaybmiller
Date Posted: 19 Feb 2025 at 7:45am

At least 6 months.outside, in snow... according to my old Willys Pickup.

I'd use an 'acid etch ' primer, maybe epoxy, or 'high build'.

You'll have to sand it down and reprime just before painting.

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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)

Never burn your bridges, unless you can walk on water

Posted By: steve(ill)
Date Posted: 19 Feb 2025 at 8:09am

primer will seal up the steel , filler , etc and protect everything from rust, damage while in storage..... as Jay said, the primer should be lightly sanded when you get ready to apply the finish coat ..... etching primer is a great idea as it STICKS to the metal really good.. A flash coat just prior to the final paint might be a good idea, as jay said..

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Like them all, but love the "B"s.

Posted By: Thad in AR.
Date Posted: 19 Feb 2025 at 8:14am

I don’t mind to spray an extra coat I just don’t want to have to take every part down to bare metal again.

Posted By: steve(ill)
Date Posted: 19 Feb 2025 at 9:10am

nah... primer can set forever on a car... just got to sand a little to get any oxide off and then a fresh thin coat on top............ replacement fenders / doors come primered ( from China) and can set for months before resell..

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Like them all, but love the "B"s.

Posted By: DMiller
Date Posted: 19 Feb 2025 at 9:34am

As steve Noted, light sand, even as light as 1000gr, just to knock off Slick or Oxidation. Normal Limit is within 12 hours to not require sanding.

Posted By: Dakota Dave
Date Posted: 19 Feb 2025 at 10:01am

If it has sealer either under it or in it it can set. otherwise it need to be sealed within 12 hours or before it gets wet. buildable primer dosent seal and the metal undernieth will rust . it will come out later after you paint and it bubbles up.