The single-component, mastic waterborne acrylic coating from Tnemec Company is designed for use on minimally prepared, sound rusted steel and previously coated surfaces. Series 118 Uni-Bond Mastic offers 200 percent elasticity and can be used with acrylic and solvent-borne urethane and fluoropolymer finish coats. Surface preparation consists of power washing steel at 5,000 psi and some mechanical hand or power tool cleaning to remove loose rust, scale and deteriorated coatings. 800/863-6321; www.tnemec.com.