To cut down on the mess try mixing on post it notes and use toothpicks to apply I usually on do one fly at a time and keep spiining them by hand. 2 or3 thin coats work better than a thick one if you don't have a spinner. i use stick on eyes after the first coat then put a coat over them to seal them.
It takes a little practice but is not that hard good luck.
I don't always fly fish but when I do I prefer salt water. Stay salty my freinds