They say you can brush it on, but I never did. An air compressor and spray gun give professional quality results. I use a touch-up gun.
Use their thinner to thin the finish, but for clean up, use a cheap laquer thinner that you can buy by the gallon at department stores.
I thin it a little less when spraying the first few coats on, as I fill in grain and build depth, but then thin it a little more for the final few coats.
No, not cured with heat. Cured at room temps.
I prefer satin for all of my bows.
I get it directly from Thunderbird.
Definitely wear a carbon filter mask that removes vapors. You don't want to breath the stuff.