Never heard of it either. I have always used PPG, or Duponts Chroma line of clears.
I have recently heard of someone who swears by Transtar. I personally havent used it, but the person recommending it swears by it, and has been using it for quite a few years. Ive seen the finished product fresh out of the booth and was impressed with the gloss and how well it layed down.
So much so, that i'm trying it on a current clients project.
[ only after receiving his blessing on using it of course ]