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Thad in AR. 
Orange Level Access
Joined: 12 Sep 2009
Location: Arkansas
Points: 9668
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 Topic: How long can primer sit before paint?
Posted: 19 Feb 2025 at 7:19am |
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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?
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24768
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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
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 88450
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Posted: 19 Feb 2025 at 8:09am |
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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.
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Thad in AR.
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Joined: 12 Sep 2009
Location: Arkansas
Points: 9668
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Posted: 19 Feb 2025 at 8:14am |
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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.
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steve(ill)
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Location: illinois
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Posted: 19 Feb 2025 at 9:10am |
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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.
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 34305
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Posted: 19 Feb 2025 at 9:34am |
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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.
Edited by DMiller - 19 Feb 2025 at 9:35am
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Dakota Dave
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Joined: 12 Sep 2009
Location: ND
Points: 3972
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Posted: 19 Feb 2025 at 10:01am |
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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.
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desertjoe
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Joined: 23 Sep 2013
Location: New mexico
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Posted: 23 Feb 2025 at 7:35am |
Hey Thad,, Like ole Jay,,I use a high build primer, after a good cleaning with thinner to remove any rust that may still be there on the edges of the repair. I've had many occasions to leave repaired parts in primer for some time while working on the rest of the project without any issues. I always use a Primer/sealer when painting a panel or a complete when changing colors to prevent bleeding. I'ma go visit to check out that Bad Boy Trk,,,!! Good Luck!!
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