We two newbies just finished building a workshop from a kit. The floor of the shop is made of flakeboard and has already becoming uneven. [The plasting wrapper that the kit came in was full of water.] We had planned to put vinyl flooring but now we're not quite sure how to proceed. From reading some of the other posts, I'm thinking of putting down another layer of flooring first, maybe 1/2" plywood and then put the vinyl on top of that. Or is there some type of leveling compound that we could use to level the flake board out. Or should we just leave it alone.