blueseal R-134a A/C Stop Leak 2 oz Can with UV Dye — Zero-Polymer Sealant, Compressor-Safe

Blueseal R-134a A/C Stop Leak is a zero-polymer, lab-tested leak sealer with built-in UV dye in a 2 oz can designed to permanently seal small refrigerant leaks and condition rubber seals in R-134a automotive systems.

When your car’s air conditioning is losing cooling power, a slow refrigerant leak is often the culprit. Blueseal’s formula is engineered for R-134a systems: it bonds when exposed to oxygen under system pressure, seals common leak points like evaporator cores and O-rings, and includes a professional-grade UV dye to speed up leak location when required. This 2 oz can supplies a compact, technician-grade treatment that works alongside standard R-134a top-off procedures.

How does this stop small A/C leaks without clogging my system?

Blueseal uses a zero-polymer, particulate-free chemistry that forms bonds only when it contacts oxygen inside the pressurized system. Because it contains no solid polymers, it won’t create particulate deposits that can clog compressors, evaporators, or recovery equipment.

• Zero-polymer formula—no solid particulates to block components
• Bonds on exposure to system air under pressure for permanent sealing
• Safe for compressors, evaporators, condensers, hoses, gaskets and O-rings
• OSHA-classified non-hazardous handling for pros and DIYers

Will one 2 oz can fix my car’s entire A/C charge?

The 2 oz can contains a concentrated sealant package and a 1 oz R-134a charge—not enough refrigerant to fully refill typical automotive systems. Use Blueseal to stop leaks and then top off the system to the manufacturer’s specified refrigerant level for full cooling performance.

• 2 oz can includes 1 oz of R-134a refrigerant—most cars need 10–12 oz total
• Requires a separate R-134a application hose or gauge set to install
• Top off the system with additional R-134a after sealing for full capacity
• Works as a preventative additive once installed; remains active over time

How quickly and effectively does it seal leaks—and what about diagnostics?

Controlled lab testing shows a 95%+ seal rate in systems losing 25 oz or less of refrigerant per year. For leaks too large for chemical sealing alone, the integrated professional-grade UV dye reveals the leak source under a UV light, simplifying diagnosis and repair decisions.

• 95%+ effectiveness on qualifying slow-leak systems (lab-tested)
• Built-in UV dye highlights leak areas under UV inspection
• Seals evaporators, condensers, rubber hoses, gaskets and O-rings
• Conditions aged rubber seals, helping restore small leaks caused by dried seals

What installation steps and precautions should I know?

Installation requires a separate R-134a hose or gauge set to introduce the can’s contents into the low-side service port. Follow standard safety procedures, avoid open flames, and ensure the vehicle is ventilated; this product is non-polymeric but should be handled per label instructions.

• Requires R-134a application hose or gauge set (sold separately)
• Introduce through the low-side service port with engine and A/C running as instructed
• Do not rely on the can’s 1 oz refrigerant to fully refill the system—top off afterward
• Made in USA and OSHA-classified non-hazardous for professional use

Who is this for? Blueseal R-134a A/C Stop Leak is intended for vehicle owners, automotive technicians, and DIY enthusiasts who want a professional-grade stop-leak treatment that won’t introduce particulates into the system. It’s ideal for cars with slow refrigerant loss (under approximately 25 oz per year), for preemptive conditioning of aging rubber seals, and for situations where quick leak identification is useful—especially when paired with a UV inspection lamp and an R-134a charging hose. Note: this listing is the 2 oz can only; separate charging equipment and additional R-134a refrigerant will be required to restore full system charge.