Stucco-Guard is a water-based acrylic sealer that provides water-resistance for new or old stucco walls. It meets standard testing for wind-driven rain up to 124 miles per hour, so it helps eliminate the damage and decay caused by moisture penetration. The product goes on milky white but dries in a clear finish. Cost: $21.99 for a 1-gallon can. Seal-Krete. 800-323-7357.