I STRONGLY and HIGHLY recommend that you DO NOT use this junk.

Often times these sealers cause more problems than they cure. Additionally if it is present, very few if any auto a/c shops will work on your a/c under any circumstances. This is because this junk will destroy their multi thousand dollar recovery machine and it is ILLEGAL for them to get remaining refrigerant out of the system any other way. They now have to keep a sealant detector instrument and check systems before recovery to protect their recovery machine investment.

It is not totally uncommon for a sealant to ruin the entire a/c system necessitating the replacement of ALL a/c components.

As far as I'm concerned, this is not the kind of thing that should be made illegal because everyone should take responsibility for their own actions, but the people who make and sell this stuff are no different IMHO than the old time snake oil and tonic salesman.

My $0.02,