The external sealants are designed to seal the projectile and primer from the outside. After the projectile is inserted, the annular gaps between the bullet and the case mouth are sealed using an anaerobic, UV-curing adhesive. Key Considerations for Selecting the Ideal ammuntion external sealant: When selecting the right sealant, there are critical criteria that are essential for optimal sealing of the projectile. There is a surface tension present between the different metal surfaces, which significantly affects the penetration of the sealant. Therefore, there are various sealant options that differ in the following ways: 1. The adhesive strength and the resulting bullet pull-out strength according to Nato AEP-97 (see diagram), which in turn affects the brittleness of the adhesiv ...