Antifouling paints should not be sprayed... very toxic and the solvents used are probably worse.
Topsides and decks are best painted with two part polyurethanes, nonskid applied with the various purpose-intended coatings like Kiwigrip will yield best results. Adding sand is an iffy proposition.. eventually the paint wears away and the dark sand is exposed.. rather unsightly after a while...
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)