LeakGuard is specifically formulated for slow leaks that can occur over a six-to 12-month period. It is completely compatible with R- 134a and R-12. As an oil-based sealant, it will not harden, crystallize, or clog the A/C system or recycle equipment. LeakGuard seeks out oxygen and airflow at the point of the leak and forms a permanent chemical weld at the leak point. Used as preventative maintenance, LeakGuard will stay in the system as a high-quality lubricant until such time that a leak occurs. UView’s LeakGuard SpotGun Jr. Kit includes the patented SpotGun Jr. Injection System, adapters, and two cartridges of Leak Guard.