has anyone ever left this butane/propane based stuff long term. I just installed new AC (scrapyard pull) in the grand prix, and since i cant get 134A over the counter in canada anymore i filled it with this stuff to test the system out. Its blowing amazingly cool i just dont like flamable gas in my AC. any ideas

Like a few ounces of the stuff is more of a danger than the fuel lines running through the engine...

I sell a boat load of this stuff, generally with good reviews.

About 3 weeks after I got the Hummer, had like 400km on the clock the RedTek rep came in. He wanted to do a test so we took a temp reading as factory, then evac'd and recharged using RedTek and the fucker blew super cold. i don't remember the number but the temp at the vents was quite a few degrees colder then as factory

I ran it for 4 full years. Over the 4 years it probably lost a little bit of the temperature drop from factory but did still blow excessively cold.

Also did an evac and recharge on one of my employees Honda's, it ran so cold that the compressor would freeze on occasion if jacked way up.

Anyways long story short, if your system if sealed, it will work nicely.