I've used this kit several times, it is commonly distributed by Mopar. Masi just stamps their name on the cover and it looks real jazzy! You will sometimes see a date on the sealant cannister but not always. The sealant is basically a liquid form of latex that will coat the inside of the tire once you inject it, which is why you have to drive the car a few miles immediately after you put it into the tire. And is also why you will need a new TPMS sensor cause it will most times be rendered in-op! It's only designed to get you safely to a location to have a new tire installed or your punctured one repaired. So don't try any long hauls if you have to use this kit. It has worked for me in each of the occasions that I have had to use it. Once even with a small puncture in my sidewall. Swestm3, with a 2012 date, I would probably order a new cannister of sealant and replace. I have paid between $35 and $45 dollars for a new cannister.
The air compressor portion of this kit is really good. It will air up a low tire in no time! It even comes with a needle, bottom panel of the kit, to air up footballs, volleyballs, beach balls etc.... I even used it to air up a air mattress once.
I hope this helps.
who u r, u r forever.... 1998 F355 Berlinetta 2008 535i 2014 GT MC Sportline pkg