I was brave and sprayed in the wind today...........sprayed the first coat, but wasnt feeling lucky, so I put a second coat on the floor by hand.
I always use Ready Seal.........and the reason why guys are telling you one way for RS and another for other products is because Ready Seal allows you to be a bit more carefree..........you can get a little too much of it here and there, and it really doesnt matter..........no backbrushing, and it will be even when it dries (they call it "goof proof")
When spraying an entire deck, I spray the outside rails/spindles, then inside, then the floor. Let the floor dry a while and apply a second coat............then remove my overspray protection and trim it out.
When doing rails by hand, and spraying the floor, I do the inside rails/spindles first, then spray the floor, then do outside rails/spindles, then spray second coat on floor. Then trim anything I missed.
Hope that helps.