Installing Floor In Boat I Have A Fiberglass Boat And Want To Know When Installing Stringers Vertically Can I Also Put Horizontally For?

I have a fiberglass boat and want to know when installing stringers vertically can i also put horizontally for? - installing floor in boat

I want to ground and that can quickly decay or Wrek done How can I seal it with 4 layers of paint please help WQAS said floor panels are periods of time.