Crawl Space-Waterproofing Paint for Interior Walls?

[lbarbour]

I have just completed a new summer home. It has a 4 ft crawl space with 8" poured concrete walls with a 3" concrete floor with a central floor drain and provision for sump pump. Underneath the floor I have 6 mill ultra vapor barrier over 12 inches of compacted crushed stone. Drain tile exists around the exterior footings. The foundation and floor was poured last year. The exterior walls and footings have been dampproof up to grade level. I am trying to manage humidity in my crawl space by treating it as a closed space. I have used a dehumidifier this summer to keep RH at 50%, the temp within the crawl space has been around 18 to 20 deg C. I keep the air circulated. The crawl space walls and concrete floor is basicilly dry. I suspect the humidity I have is from curing of the walls and floor. My floor is not insulated. I was tring to avoid insulating to avoid potential pest problems should they get into the crawl space. My concern is fall and winter when temperature drops. Will RH go up and will this cause problems for upstair flooring? Should I heat the crawl space? To lessen the humidity I was thinking about using a waterproofing paint "Zinsser - WaterTite" for the interior walls. Is this a good idea - trapping moisture within the concrete walls? I know concrete needs water to properly cure but is trapping moisture in the walls going to cause me problems? Any thoughts most welcome.