Chalk Paint® by Annie Sloan is great for outdoor use with no sealer! Sisters Unique painted a brick ranch house exterior and the gutters, too, with Old White. They say, "Nothing was used to seal the paint. Chalk Paint® by Annie Sloan is extremely durable and hard wearing. The brick absorbs the paint and it will weather over the years, but it will have a beautiful patina. Brick: Mix of Old White and Water. Gutters: Full strength Old White."