Auto Master Leak Shield Sealant - Mastercool

The Mastercool 53615-A Auto Master Leak Shield Sealant is designed to quickly locate and stop small refrigerant leaks in automotive A/C systems without requiring major component replacement. Compatible with both R134a and HFO-1234yf systems, this professional-grade sealant treats metal and rubber components while conditioning O-rings to help prevent future leaks.

Key Features

• Compatible with R134a and HFO-1234yf refrigerants
• Safe for both standard and hybrid vehicle A/C systems
• Seals small leaks in metal and rubber A/C components, including evaporators, condensers, O-rings, gaskets, and hoses
• Includes O-ring conditioners plus anti-wear and antioxidant additives to protect system components
• HFC-free aerosol formula with no harmful polymers that can clog or damage A/C systems
• Designed for professional use in automotive and light truck air conditioning service

Applications

The Auto Master Leak Shield Sealant is intended for use in servicing automotive air conditioning systems where minor, hard-to-find leaks are present. Ideal for passenger vehicles, light trucks, and many hybrid applications using R134a or HFO-1234yf, it can be used during A/C service to address small leaks in evaporators, condensers, fittings, and flexible hose connections. This product is particularly useful in situations where component replacement is not immediately practical, helping technicians restore system performance and reduce call-backs while maintaining system integrity.