I have used fullerplast, I really like it. Never used a gravity type gun but I don't see that being a problem. Dries fast, hard, water proof. Like Lewis, that's true for any finish, use gloss first then matte it last coats. you can do this with same can of finish...skim off the top before stirring, you get gloss. Stir well, you get satin. Skim off the bottom without stirring, you get matte.
I believe Bear always used Fullerplast, as well as Appleby's for their tables. Designed for wooden propellers, so it's tough.
Dan