Thompson's® WaterSeal® is an industry leader in exterior waterproofing products and America's Recognized Brand in Water Protection. With a full line of cleaners, waterproofers and exterior stains, Thompson's WaterSeal products help homeowners protect and beautify their outdoor living spaces. In 1929, polymer chemist Edward Addis Thompson developed a formula that protected concrete surfaces from exterior water damage. Today, more than 90 years later, the formula that became known as Thompson's WaterSeal has been used by architects, engineers and homeowners to protect wood and concrete surfaces against water.