Product Description Rectorseal Better Bubble detects leaks of refrigerant gases, air, oxygen, and most other gases. Its thick formula can be used at various temperatures and pressures with all types of pipe, tubing, valves, tanks, A/C and refrigeration coils, and similar applications. Will not corrode metal surfaces or attack plastic or rubber. Application and cleanup are safe and simple. From the Manufacturer Better Bubble leak locator is formulated to pinpoint the smallest leak quickly and easily. Safe to use on most gases including ammonia, oxygen, air, and refrigerants. Its thick formula produces large, long lasting, well defined elastic bubbles that stand up under pressure and windy conditions. It is the newest and most advanced leak locator formula It detects leaks of refrigerant gases, air, oxygen, and most other gases Its thick formula can be used at various temperature and pressure applications It is biodegradable It will not corrode metal surfaces or attack plastic or rubber