For the guy that doesn't build many bows, I'm a fan of ML Campbells Krystal. That's all I've used on every bow I've ever done.
It's fairly inexpensive and a cheap Harbor Freight sprayer with a cheap 20 gallon air compressor is all you need. I use three build coats of Satin. Let dry over night, sand with 220/320 and the use Matte with one medium coat followed by several coats of high air, very low volumn. Just trying to dust it witout creating a sand or pebble type of texture.
The Swap Bow that Kenny just received was done in all Satin, as I ran out of Matte, with this method and turned out decent.
I've also been known to buff them down while not completely dry with a paper towel or VERY lightly with a green Scotchbrite sanding pad if needed. You just have to be careful with Scotchbrite that it doesn't look like you sanded it.