There are different products.....For a deck....It's usually not sprayed, unless its a small inderacate repear to match the factory nonskid.
Usually rolled and the whole surface is done so it matches. Gellcoat with added non skid.......Paint....with added non skid....or one of those Nonskid paints with which I've heard people rave about, but my experience was Not good at ALL. This was done with Awlgrip paint and Rustolume nob skid at 1/2 of what they say to use.