Choose Options Hi-Tech 18021 Rubberized Undercoat, Aerosol Hi-Tech 18021 Rubberized Undercoat 19.4 ounce aerosol Hi-Tech 18021 Rubberized Undercoat is a deep black rubberized undercoating to protect metal from gravel, moisture and road salt and is a paintable rust preventative. $8.11 - $100.49 Choose Options Compare