I have lifelong friends (husband/wife team) that make custom fishing rods and crankbaits, and make a living distributing fishing equipment in the western Missouri area. They don't use KBS, they use either Max2K or a special super thin epoxy to coat their hand made lures.
In practical use on MP and HP size rockets, I've found Max2K to be significantly harder, more durable, and glossier than KBS.
The only downside to Max2K is that it's catalyzed and requires PPE when spraying.
Max2K spray and a can of KBS are the same price on Amazon, and both are commonly available.
I've used both, and found that KBS may be ok for smaller projects, but the Max2K protects and endures orders of magnitude better when used in larger MP and certainly the recovery on the ground dragging that many HP rockets are subject to.