What do folks think about painting the floor with a "water proofing" paint first? I know they don't actually keep out water - or very little anyway. However a couple of years ago I painted the walls in my basement and with some type of water proofing paint from a big box store (can't remember the name now) and it made a noticeable difference in the amount of moisture in the air in the basement. My dehumidifier runs about half as mush as before now. Why would I not want to do a similar thing with the cement floor before laying down a 6 mil vapor barrier?