Nu-Calgon4050-11 EasySeal Direct Inject-UV Dye Refrigerant Leak Sealant, One Size Treats Systems 2 to 7.5 Tons

This stuff works great. I was always adding freon every year to my air conditioner. I added this a year ago and this year we did not have to add any freon. This stuff really works

I am a refrigeration professional of over 44 years experience. Normally I would not recommend a product like this, but I have a 22 year old A/C system in my house with a leak in the coil last summer . I didn’t have time to replace the system right then, so I gave this product a chance. 13 months later and I still haven’t replaced the system and haven’t lost any additional refrigerant. I may let this unit run until it completely dies. It is a heat pump so runs year round

I have waited 2 months after using this product to write this review. I have a 22 year old R22 unit that was losing about a half a pound of refrigerant a month. So a slow to moderate leak. This product was my last attempt to save this system. I have HVAC experience and found the product easy to use. After 2 months I have not had to add refrigerant and leak seems to be sealed. This system is on a rental unit and if I can get a few more years out of it I will be happy. I recommend this product as a last ditch effort to extend the life of a failing system.

I was very skeptical using this product and I was also concerned about stopping up the free on system and totally ruining it. I didn't have a large leak I don't have a clue where it was it was very slow. But honestly I'm very happy I used this it worked very well it stopped my free on loss totally since I put this product in the system I have not had to add any more freon to the system and it works very well

I was hoping this product would've found the leak and seal it. The leak must've been too large for this product. It started clumping around the leak, so I had high hope. I was able to easily find it, in the inside unit evaporator coil, on a U bend. Had a buddy come over and brazed the leak. Good as new.

Applied this product to my system as instructed. It did not stopped the leak. Wasted $72. Don't buy this product, not recommended!!

So far it seems to be working, it's been a little over a month and AC is still blowing cold. I normally lose about 1lb of R22 every year on my heatpump. This year I decided to try this product after doing a fair share of reading on this product. I figured even if it didn't fix the leak it would show it to me and I could fix it or have it fixed. Easy to install, I did it while adding freon. YouTube has a ton of video on how to do it.

Under the labeled conditions it does what it says! Great product!I used this in June 2023. It is now February 2025. We live near Tampa Bay in Balm Florida. We have some summer days of 105° with a Reelfeel of 125°. I was losing .5 lbs per month up until June 2023. Since adding this product nineteenonths ago, no leaks.2010 Rheem.14SEER 3.5T.