The screws holding the fiberglass and wood floor together on my deckboat were so rusted they all came undone. I've pulled all the old screws, and screwed new ones in, and the floor is nice and tight/hard again, but now I have ~50 holes were the old screws used to be. What can I use to fill the holes? Is there anything I can use on the entire floor? Carpet will go over it, so I don't care how it looks.