blueseal A/C Stop Leak for R-134a, 1.25oz Single-Dose Non-Polymer with UV Dye — Seals Metal & Rubber

BlueSeal A/C Stop Leak is a non-polymer, mineral-oil based sealant formulated for R-134a systems that bonds under pressure to seal evaporators, condensers, hoses, gaskets and O-rings while including a professional UV dye for fast leak detection.

If your vehicle’s air conditioning cools poorly after a recharge and slowly loses refrigerant again, this single-dose bottle is designed to address the most common slow leaks without adding solids that can clog valves or recovery equipment. The formula activates when it meets oxygen under system pressure, forming bonds at tiny leak sites and remaining active to help prevent future losses. Each 1.25oz bottle treats one car and is specifically for R-134a systems; it is not compatible with R-1234yf.

How does BlueSeal stop slow A/C refrigerant loss?

The sealant uses a mineral-oil carrier and reactive components that bond when exposed to air under the system’s pressure. This mechanism creates a thin, durable seal at the leak site without leaving particulate deposits that can interfere with expansion valves or recovery machines.

• Bonds on contact with oxygen under pressure to close small cracks and pores
• Non-polymer formula avoids solid residue that can clog TXVs or expansion valves
• Works on both metal and rubber leak points for broad system coverage

Which parts of the A/C system can this product fix?

BlueSeal is formulated to address the typical slow-leak locations found in R-134a circuits. It is effective on components where small weeps and aging seals allow refrigerant and oil to escape over time.

• Evaporator cores and condenser fins where slow pinhole leaks occur
• Rubber hoses, gaskets and O-rings that harden, crack or shrink
• Seals and fittings along the circuit where hairline leaks form

Will adding this stop leak harm my A/C system or recovery equipment?

Because the formula is non-polymer and mineral-oil based, it is designed to avoid forming solids that could block expansion valves, TXVs or recovery machines. It is lab-tested for common usage levels and manufactured to be compatible with metal and rubber components in R-134a systems.

• No polymer solids that risk clogging service valves or expansion devices
• Safe for metal evaporators, condensers and rubber seals when used as directed
• Includes professional UV dye, eliminating the need for a separate leak-detection product

How is the product applied and what results should I expect?

Application is straightforward: one 1.25oz bottle treats a single R-134a vehicle. After introduction into the low side of the running system, the formula circulates and reacts at leak sites. Independent lab testing shows a high success rate on low annual loss systems, but very large breaches will require a repair and dye-assisted location.

• Single-dose 1.25oz bottle: add to low-side service port with engine and A/C running
• Active formula circulates and bonds; remains active to help seal future small leaks
• UV dye included for quick localization of leaks that exceed the sealant’s scope

Who is this for? BlueSeal A/C Stop Leak is intended for vehicle owners, fleet managers, used-car dealerships, and technicians dealing with intermittent or slow refrigerant loss in R-134a systems who want a documented, professional-grade option before resorting to repeated recharges or full component replacement. It’s not a substitute for repairing large mechanical damage or for use in R-1234yf systems; for extensive leaks, professional diagnosis and part replacement remain the correct approach.