Hello Jim,
I’d like to chime in with my experience on [sealing ammunition primers–a topic raised by Teddy Jacobson [1].] If you’re looking for a sure fire way to protect your ammo under the worst possible conditions, you can’t do better than George and Roy’s Primer Sealant [2]. The sealant is nitrocellulose based (the same as military and commercial ammo makers use), rather than lacquer based.
I was a distributor of the sealant for a number of years and part of our sales pitch was that if you sealed your bullets with George and Roy’s, you could throw the ammo in a bucket of water for a week and it would emerge unscathed. Well, a customer was the range officer at a Florida police department. He sealed 50 rounds with the product, then dumped them into a bucket full of WD-40 and left them there for a week. When he later tested them, he had 100% go bang. It doesn’t get any better than that. Regards, – Hawgtax