Blueseal - R134a A/C Stop Leak with UV Dye - 2 oz

The Blueseal R134a A/C Stop Leak with UV Dye provides a targeted solution for minor automotive refrigerant loss. Designed for car owners and professional technicians handling R-134a MVAC systems, this 2 oz treatment seals small leaks and helps locate larger breaches without damaging critical hardware.

The zero-polymer and zero-particulate formula is engineered to protect your air conditioning system. Because it activates and permanently bonds only on contact with oxygen, it will not clog the compressor, evaporator, or recovery equipment. Controlled testing confirms a 95% or higher effectiveness rate on systems losing 25 oz of refrigerant or less annually, sealing evaporator cores, condensers, hoses, gaskets, and O-rings.

Beyond immediate repairs, the formula remains active inside the system to condition dried rubber seals and seal new leaks if fresh air enters. For leaks that are too large for chemical sealing alone, the integrated UV dye pinpoints the escape point under a UV light. The included reusable hose features a self-sealing rubber valve and an analog 0-200 PSI gauge with color-coded fill, alert, and warning zones to assist during application.

Keep in mind that this product is formulated exclusively for R-134a automotive systems and is designed for slow leaks rather than major structural failures. Additionally, the refrigerant recharge is sold separately, so you will need to source extra refrigerant if your system requires a full refill.

Verdict: Blueseal R134a Stop Leak is a reliable, DIY-safe choice for drivers experiencing slow refrigerant loss in their car air conditioning. It offers an effective chemical seal alongside diagnostic dye, provided your vehicle uses R-134a and does not require an immediate mechanical rebuild.

A great fit if you:

• Drive a vehicle with an R-134a AC system losing 25 oz of refrigerant or less per year.
• Want an all-in-one chemical seal that also conditions aging gaskets and O-rings.
• Need built-in UV dye to visually find where refrigerant might be escaping.
• Prefer an applicator kit that includes a built-in 0-200 PSI pressure gauge.

Consider something else if you:

• Own a vehicle that uses a refrigerant other than R-134a.
• Have a severe, rapid leak exceeding 25 oz of loss annually.
• Expect a complete recharge kit that includes extra refrigerant in the can.

Will this formula clog my car air conditioning compressor or recovery machine?
No. The zero-polymer, zero-particulate formula only bonds when it contacts oxygen, ensuring it will not clog compressors, evaporators, or recovery units.

What kind of leaks can this product fix?
Testing confirms over 95% effectiveness on systems losing 25 oz of refrigerant or less annually, sealing metal and rubber parts such as condensers, evaporators, hoses, gaskets, and O-rings.

Does this kit include refrigerant?
No. The package includes the 2 oz stop leak formula with UV dye and the reusable hose with a built-in gauge, but refrigerant recharge is sold separately.

How does the UV dye work?
If a leak is too large for the sealant to close, the built-in dye escapes at the leak point and glows under a UV light to reveal the exact source.