I'm pretty sure the 2k means 2 part or catalyzed, regardless of rattle can or regular through a spraygun. It is also not exclusive to clear, catalyzed colors would also be 2k. It is an excellent protective coat, impervious to fuel or most anything else modelers would normally use. It remains clear and durable with no yellowing for many years as you would expect from something developed for cars. It does require protective equipment to spray, at the very least, a quality respirator.