Spraying in a humid environment can trap moisture in your instrument's new finish, causing a milky appearance known as "blushing." Not quite what you expected! When you can't avoid spraying a waterbase finish in less-than-ideal conditions, Target Waterbase Retarder can help. Added to the finish before spraying, it slows down the drying time to help free the excess moisture. In hot, low humidity conditions when your finish is drying too quickly, Retarder aids surface flow-out to help level the finish.