Harwell Brothers™ 2955 Rusty Metal Primer is a  0 VOC, moisture-cure urethane for ferrous, non-ferrous metal, Concrete, and wood substrates. The design benefit of the penetrating nature of this primer/sealer/Finish allows for superior adhesion to marginally prepared surfaces when compared with most industrial coatings. It is ideal for use as a tie coat over most existing coatings and can be used in red lead encapsulation systems. Does not create surface tension on aged coating systems. A reinforced single component primer suitable for use on surfaces where it is not practical to prepare the substrate by abrasive blasting methods.