hok has a "flow" clear with has an f in the part number. From what ive gathered, its you should spray the regular clear then wet sand with 600 or 1000 and reclear with the flow clear. HOK is a a softer clear but only for a longer window than anyother clear. In my opinion they all dry pretty hard. the HOK is just made to polish so i stays soft a little longer.. the 72500 dries rock hard though, not just hard. another advantage to a softer clear is that if a rock or something does happen to hit it its just going to make a small divet instead of a big flake of paint coming off. Ive painted all kinds of cars with all diff brands. they all seem to last and in the end its your call. Like i said though. i prefer the 2021 for my cars. its right between the dupont and HOK. the deepness and luster is unmatched in my opinion.
i would call it more user friendly than HOK or 72500. the 7779 is pretty user friendly too.