I don’t know what everyone else is using, but I’m going to guess it’s the stuff from the auto stores. Something like $10 for a can. I don’t know anything about that kind, or its results.
The kind I use is $80, and it’s not a clear coat (or even in a can). And it needs to be clear coated after you use it.
So, really, you should probably just go look at which one you intend to use and then read and see if it needs a clear coat or if it IS a clear coat.