The EasySeal line has proven to be the number one trusted refrigerant leak sealant brand for over a decade, with millions of leaks sealed. It is compatible with all commercially available refrigerants including the new HFOs, A2Ls and hydrocarbons like R-454B, R-32, R-290 and R-600a. EasySeal Ultimate is the strongest and fastest leak sealant on the market. EasySeal Ultimate features Rapid Fusion Technology™ for a stronger bond with quick and easy injection. The UV dye allows you to see where larger leaks are with the use of a UV light.