ProSeal22 A/C Seal Treatment (4 oz. can)

Product worked as advertised. My air condition still working after 4 years. Highly recommended

Put 2 in a 4 ton unit with a pin hole leak on the a-coil. So dang small it takes a year to loose refrigerant. It worked perfectly and very easy to use.

Leak was small enough to require a recharge once/year. After using this product, leak stopped over a 2 month period and held over winter and spring idle period. No sign of leak over month of summer use..

Works great

Hasta el momento en una semana ha trabajado bien

I'm sure it works wonders but my piercing valve didn't work on the seal for some reason. The thread on the can is press type and not cut thread and annoying so use caution when turning a fitting on the threads.

Long term update.I have a very small leak. Will hold -30 vacuum for days, and only then after a week vacuum reading is -28 or so.. And must be fair here, system is 28 years old. I have use this product twice over the last three year holding a enough refirgerent to cool the home all summer. But both each times system is empty after winter. I would not recommend this product for a long term fix with a small leak . That and the high cost of refrigerant these days. I'm in the process of renewing my complete home A/C system.

I use this in Hope's of stopping a leak I believe I have somewhere in my system. It was easy to install with my fingers crossed that it works for my unit, but it didn't. Less then 3 weeks all my freon was gone again. I dont know what to do now but change the unit.