Took me about a half hour the one deck done plus a little on the mid deck, I have autobody experiance so I'm a fast taper but fast != quality. I think im going to brush it with a sable brush. Although a stiffer brush would make for more "roughness" thats why I wanted to airbrush it, easier to make it completely matte.
I'll probably tape around areas I dont want to have to scrape paint off carefully with a razor, instead of taping around all the deck planks.