Graco 390 airless sprayer applying Helmsman spar urethane

I'm spraying this on my new pine, tongue-in-groove porch ceiling.  Everybody said to roll or brush it on, but as one wise lady said, "ain't nobody got time for dat."

Water-based Helmsman spar urethane, not diluted
Graco 390 airless sprayer
411 tip
2/3 pressure
Walking fast
Approx 800-1000 sq ft per gallon
3 coats

Hope this helps!