Stops 10 lbs. of water pressure. Prevents the growth of mold and mildew on the paint film for up to 5 years. Apply to wet or dry walls. Ultra low odor formula. Note: This product contains a mildewcide to prevent the growth of mold and mildew on the paint film only. Use for basements and other interior/exterior masonry surfaces. Clean up fresh spills with rag and paint thinner.