I have a damp basement that had been painted with masonry waterproof paint once, but there were so many tiny holes in the coverage that it really needed a second coat to properly seal the walls. I chose UGL DRYLOK Masonry Waterprooferat Lowe's because it was the least expensive waterproofer and it came with a 10 year warranty. A fiber mixed in with the paint gives UGL DRYLOK Masonry Waterproofera thick, buttery consistency to fill in tiny holes in the masonry, but big holes need to be plastered first. There's an ammonia odor to the paint that's noticeable for the first day, but it's gone after the paint dries. A gallon of DRYLOK didn't cover as much of the basement walls as I hoped it would, and I used up 3 gallons of masonry waterproofer for 25' x 25' x 6' of wall space. UGL DRYLOK Masonry Waterprooferis a latex-based paint, so cleaning up my brushes was easy with just soap and water.
After waiting for a few weeks and a few heavy rains, I was pleased to notice that there was very little bleed-through of rust stains with UGL DRYLOK Masonry Waterprooferlike there was with the other waterproofer that I had tried. And there's a very noticeable difference in the degree of dampness in my basement. I would recommend UGL DRYLOK Masonry Waterproofer for sealing damp basements.