Primer sealer.

Does it work? Yes. Do you need it? Only you can answer that.
It's useful for ammo that could be subjected to extreme conditions. Just my two cents. Cheers
 
I think a primer sits in the pocket pretty tight by itself, it would need to sit in water for quite some time I believe for the water to ruin it. I would guess hours to days for the water to get in, my guess at least. So I think sealant isn't required in most circumstances, IMHO
 
OP asked about "primer sealer" - I have used gallons of it - but as a Primer and Sealer on plywood and OSB board. Works great for that. I have never tried to use the stuff on primers in cartridge cases - I have never sealed those primers, since 1976
 
DiMP said:
I think a primer sits in the pocket pretty tight by itself, it would need to sit in water for quite some time I believe for the water to ruin it. I would guess hours to days for the water to get in, my guess at least. So I think sealant isn't required in most circumstances, IMHO
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It's extreme wet condition AND a change in temperature that will create a chance for fluid to enter the case. Again just my two cents. Cheers
Sorry forgot change in elevation..
 
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Federal applies sealant at the factory. Military ammo has sealant on the primer (while they may not have the highest specs I don’t think the military usually asks for totally unnecessary steps). I do it just on my hunting ammo that faces pretty variable weather and wet conditions.
 
Why not devise a test to compare them?

A) nail polish B) nail polish thinned with acetone C) commercial primer sealant D) no sealant as a control.
Test them by soaking in water for a prescribed amount of time... 24hrs maybe?
This is assuming that water isn't getting past the bullet on the other end.

You could also do a leak down test with a few psi of compressed air on the mouth of the case with the primer in the pocket.
 
I watched a U-tube video a couple of years ago that involved subjecting both rimfire and reloaded centerfire ammo to submersion in water for 24 hours to several days to weeks and up to a month. If memory serves me right things were going bang pretty reliably for up to 2 weeks in spite of being underwater all that time. After 4 weeks about a 75% failure rate.

Ive been shooting and reloading for many years and all my ammo goes into high quality Ziplock freezer bags. No issues whatsoever. I will double bag if ammo is going to be bounced around in a knapsack for a period of time.
 
Riven said:
Wondering is anyone uses primer sealer? Came across some at my LGS today.
Is it worth the time or money for storing ammo??
Will clear nail polish work the same?
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At first I thought there is absolutely not needed but then......................................
Been reloading for more years then I care to remember and wont throw a Casing in the Garbage until the process of Case separation has started. On the old beat up .338 Win Mag. my goto Rifle when in the Rockys, some of the Casings Primer Pockets are not as tight as they used to be. Getting wet in location where I Roam is a normal occurrence so is seeing Grizzly Bears. Perhaps Sealing the Primer is not such bad Idea.
 
Brassman66 said:
At first I thought there is absolutely not needed but then......................................
Been reloading for more years then I care to remember and wont throw a Casing in the Garbage until the process of Case separation has started. On the old beat up .338 Win Mag. my goto Rifle when in the Rockys, some of the Casings Primer Pockets are not as tight as they used to be. Getting wet in location where I Roam is a normal occurrence so is seeing Grizzly Bears. Perhaps Sealing the Primer is not such bad Idea.
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If you are relying on a firearm and ammunition to protect you from grizzlies, I would think using cases that don't have loose primer pockets and are not verging on case head separation might be a good idea.
 
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