SKU: 105000110
UPC: 400256111206
MPN: MPS02
The Roboco Laboratories Bullet and Primer Sealer is a brush-on liquid that waterproofs handloaded and factory ammunition at the two joints where moisture gets in: the primer-to-primer-pocket seam and the bullet-to-case-mouth seam. It's aimed at handloaders who store ammo long-term, hunters who carry rounds through rain and snow, and anyone who wants sealed primers without buying premium factory loads. A single 1/2 oz bottle (MPS02) treats roughly 1,000 rounds, so a little goes a long way across a season of priming and case work.
Application is straightforward. The sealer brushes on around the primer and the case-mouth joint, then dries to a tough, waterproof barrier that keeps water out of the powder charge and helps prevent moisture-contaminated misfires. Per the manufacturer's stated performance, treated rounds withstand up to 30 days of total water submersion, which covers nearly any field or storage scenario a shooter is likely to face. The product is made in the U.S.A. Beyond metallic cartridges, it works for muzzleloader hunters and black powder shooters, applied to caps on nipples of traditional muzzleloading rifles and over primers on inline guns. That makes one bottle useful across a range of hunting bullet loads and primer types.
Reach for this sealer when you're building self-defense carry rounds, packing hunting ammunition for wet-weather trips, or putting up stored ammo you want reliable years from now. Seal the primer first, let it cure, then run the joint at the case mouth after seating the bullet. At roughly 1,000 rounds per bottle, it's cheap insurance against a dead primer at the worst possible moment. Pair it with the rest of your bench setup, from loading blocks to your priming tools, and treat rounds in batches as you load.
The 1/2 oz bottle contains enough sealer to treat approximately 1,000 rounds, so a single bottle covers a full season of handloading or a large batch of stored and carry ammunition without running out.
Per the manufacturer's stated performance, treated rounds withstand up to 30 days of total water submersion. The sealer forms a tough barrier at the primer pocket and case mouth that keeps moisture away from the powder charge.
Yes. It works for muzzleloader hunters and black powder rifle shooters. Apply it to caps on the nipples of traditional muzzleloading rifles and over the primers on inline muzzleloaders to protect against wet-weather ignition failures.
Brush it around two points: the seam where the primer meets the primer pocket, and the joint where the bullet meets the case mouth. Seal the primer first and let it cure, then treat the case-mouth joint after seating the bullet.
For ammunition stored long-term or carried in rain, snow, or humidity, sealed primers reduce the risk of moisture-contaminated misfires. If you load self-defense or hunting rounds you need to fire reliably years later, it's worthwhile protection.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
