Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
?? HIGH-CAPACITY FOR HEAVY USE - 32 oz bottle delivers up to 128 applications; perfect for high-volume shops and fleet maintenance | ?? R-1234YF, HYBRID & CO2 READY - Universal formula meets the needs of modern A/C systems and legacy refrigerants alike | ?? BRIGHT, RELIABLE UV PERFORMANCE - Produces strong, visible fluorescence under UV light for confident leak detection | ?? SAFE AND VERSATILE FORMULATION - Compatible with all common A/C lubricants, including PAG, POE, ester, and mineral oils | ?? TRUSTED U.S. BRAND - Mastercool brings over four decades of expertise and responsive U.S.-based technical support
I've been using the Mastercool UV dye for my car's AC system, and I have to say it works like a charm! The 32 oz bottle gives me plenty of applications, and it's easy to track down leaks with the dye. I'm using it with R-1234yf refrigerant and so far, no issues at all.
M
Michael O'Leary
Bottle arrived damaged, dye leaked out
I was excited to try the Mastercool UV dye, but the bottle came with a dent and some dye had leaked out. I managed to use it for a few applications, but I can't shake the frustration of the delivery issue. I hope to get a replacement soon!
E
Emily Chen
Decent product, but shipping was slow
The Mastercool UV dye itself is solid and works well for checking leaks in my hybrid CO2 compatible system. However, I was a bit disappointed that it took longer to arrive than I expected. Other than that, it does what it claims, and I got plenty of uses from the bottle.
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FAQs
Have a question ? We are here to help.
Is the shipping free?
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
