ooh, home fixups: I now have a crawl space attached to my (400 sq ft) basement, where I do the laundry and have the cat box -- some kind of gritty dust is constantly in the air, and will be worse when I finish drilling holes in the cement wall to attach chicken wire so my cat will stop exploring the crawlspace ( hasn'rt used it for a box,yet, thank goodness) chipped cement around the windows and lots of other places -- anyone know a good sealant that will lower the dust rate? (I laready got a large, powerful air purifier)