Spar varnish is a complete pain in the ass
but it looks way better then paint, i have it on both my cat floor and raft floor, plus side boards and dry box, has to be sanded and recoted every 2 years, but is awesome and worth it if you enjoy the natural beauty of wood, don't think i could bring myself to paint plywood that is a part of my raft.
Wood is much more solid to stand on than many floor options, and doesn't blind you like diamond plate, and has a certain warmth, and satisfaction to building it yourself.
Got to love the splinters and num hands from sanding it, makes river beers taste that much better.
Would probly splinter and pop my tubes if i had a bad wrap though.
" I wish I were a headlight, on a North bound train..."