Seals the primer-to-primer-pocket joint to produce a tough, waterproof barrier that keeps moisture out of your bullets powder to help prevent misfires. Wont affect muzzle pressure, velocity or accuracy. Extends the storage life of your cartridges under high humidity conditions. Withstands up to 30 days of total water submersion. Fast drying, easy to apply to loaded ammunition. The oz. bottle contains enough sealer to treat approximately 1,000 rounds.