Damplock ($24) is a waterproof paint that withstands 20 psi of hydrostatic pressure. It also reduces radon as penetration through basement walls and is ideal for use on concrete blocks, concrete surfaces and retaining walls. Available in bright white with a satin finish, 1 gallon of Damplock covers as much as 125 sq. ft. You can apply it with a roller or a brush and clean up with soap and water. Convenience Products. 800-323-1357, www.seal-krete.com