TCP global is alright but I typically go on www.autobodytoolmart.com and use their Kirker products.
I've had really good results with them. Kirker typically sells their paints in 3/4 gallons then you buy a quart of activator/hardener (single stage) or reducer (two stage then clearcoat)
I haven't tried their clearcoats just yet. I have two gallons that I'm going to utilize soon.