Alumahyde II is durable stuff, but you need a good measure of patience to use it successfully.
Recoat within 30 minutes or wait until it fully cures, is sound advice.
I've found that complete cure takes at least a week & that heat from a hairdryer, or from a summertime 120º garage, doesn't really shortcut any.
If you try to rush it, it shows.
For a single color coating, this may be for you. For multiple (camo) colors, hunting season will be over before you get a chance to use your refiniished gun.