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 may be used on surface temperatures from 0º to 250ºF, is non corrosive, will not attack rubber or plastic, and is biodegradable. 32 oz. spray bottle.