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Old 04-07-2019, 10:28 AM   #1
Bean Counter
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Shelf life of primers?

Dumb, DUMB question time - I have some PPG epoxy and high-build primer, sitting in the original cans, never mixed. It's been kept in a cool environment, never subjected to temp changes or humidity. Any suggestions on what the shelf life might be on these? I know I've had it several years but can't remember exactly when I bought it - but I'd like to use it now if it's still viable.

Thanks,
David
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Old 04-07-2019, 12:03 PM   #2
pwdcougar
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Re: Shelf life of primers?

I thought I read on one of my cans of PPG DX primer that it was only good for a year un opened.
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Old 04-07-2019, 02:57 PM   #3
72bowtiestepper
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Re: Shelf life of primers?

I would mix a small amount up & spray a scrap sheet metal part that was clean...after drying try sanding it & if it seems OK, use it. I have paint & primer a LOT older than 1 yr. that I have used with good results.
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Old 04-07-2019, 06:10 PM   #4
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Re: Shelf life of primers?

The hardener is the BIG deal, if it's been opened and exposed to oxygen, that's the issue.

Ok, this is coming from a former paint rep and painter for many years:

What is the WORK worth to overcome a failure? I don't know about your extra time from making a living and family but mine is DAMN valuable and worth MUCH more than what that primer is worth!

I recently threw out a few thousand dollars in primer, clear, paint and hardener. I had many gallons of clear and primer. And these hardeners were never opened. I just thought, I am not going to work my butt off and get something finally painted to have it fail. It's not worth it, it's just not worth it. The way I look at it is if I were to apply it to a few fenders over bondo work and all and it were to fail, what would I pay to make it all go away and not have the extra work of stripping it all down and re-doing it? I'll tell you what, I would pay a hell of a lot more than what that primer costs thats for sure!

Check out SPI https://www.southernpolyurethanes.com/ I have been getting epoxy primer from them now for the last few years. It is an AWESOME product, I mean really super. They ship for free, it's on my door step in a few days, done deal. I will be getting my paint and clear from them when I am ready for that.


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Old 04-07-2019, 06:14 PM   #5
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Re: Shelf life of primers?

Call your local PPG distributor and give them the batch code and ask them.
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Old 04-07-2019, 06:20 PM   #6
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Re: Shelf life of primers?

That is a good answer too Foot Stomper! IF it hasn't been open though. That makes all the difference.

Brian
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Chopped, Sectioned, 1953 Corvette 235 powered. Once was even 401 Buick mid engined with the carburetor right between the seats!
Bought with paper route money in 1973 when I was 15.

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Old 04-08-2019, 06:14 AM   #7
Bean Counter
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Re: Shelf life of primers?

Thank you, everyone, for the help. I'll check with PPG - but I'm pretty sure that the primer will be out of date. And I certainly don't want to take a chance on screwing up my latest project. My dad always told me to do things right the first time - so I'm confident that I'll be picking up some new primer very soon.

Thanks again,
David
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Old 04-08-2019, 11:16 AM   #8
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Re: Shelf life of primers?

If you have a buddy that uses his truck to haul stuff, offer to repaint the inside of his bed for free as a test for your paint. It is going to get scratched up anyway so if something goes bad with the paint, no real loss.
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Old 04-08-2019, 11:39 AM   #9
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Re: Shelf life of primers?

Quote:
Originally Posted by Bean Counter View Post
Thank you, everyone, for the help. I'll check with PPG - but I'm pretty sure that the primer will be out of date. And I certainly don't want to take a chance on screwing up my latest project. My dad always told me to do things right the first time - so I'm confident that I'll be picking up some new primer very soon.

Thanks again,
David
Funny story with my dad on this subject. My dad has been gone now 15 years. I used to stay at their house over the weekend when the live in nurse was off. One afternoon I was making them lunch and there was some hamburger that looked old in the fridge. I asked him how old it was, he said "No big deal just cook it, that's three dollars of meat." I said to him "How much would you pay to make you feel good if you woke up in the middle of the night vomiting?" LOLOLOL He looked at me and I could see he "got it" and he said "Throw it away." LOLOLOL

Brian
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Chopped, Sectioned, 1953 Corvette 235 powered. Once was even 401 Buick mid engined with the carburetor right between the seats!
Bought with paper route money in 1973 when I was 15.

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Old 04-08-2019, 03:24 PM   #10
72bowtiestepper
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Re: Shelf life of primers?

Quote:
Originally Posted by Dead Parrot View Post
If you have a buddy that uses his truck to haul stuff, offer to repaint the inside of his bed for free as a test for your paint. It is going to get scratched up anyway so if something goes bad with the paint, no real loss.
Great Idea ! Like I said in a earlier post...I have used paint & primer years old with no bad results, but I don't paint vehicles for a living...just my own stuff as a hobbiest, so proceed with caution if you decide to try using it.
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