2 in 1 Primer Red Oxide, 20 oz Aerosol 2 in 1 Primers are a specialty coating designed for easy and convenient priming of metal and plastic parts..These primers help prevent rust and seal out moisture, while providing a smooth base for topcoat application on metal substrates..2 in 1 Primers also have excellent flexibility and adhesion properties that enable them to be applied to flexible and rigid parts..2 in 1 Primers are fast drying, provide superior fill and build, and are easy to sand..They are compatible with virtually all automotive paints. Product Type: Aerosol. Activator/Hardner used: N/A 4623