We have a 2006 16' cruiser, and the ceiling, walls, and deck are very bumpy and striated. I don't care about the ceiling and walls, but it would be nice to flatten out the deck by screeding some product in, in at least the aft bilge area for easy cleaning, but without raising the height of the deck so that water is impeded from flowing to the bilge, and something that's paintable. Anyone have product suggestions for doing this? thanks!