For best corrosion protection, Element Zinc Under Coat (ZincUC)

Zinc rich primers are used to protect steel surfaces from corrosion. Unlike regular epoxies which resist corrosion by forming an impermeable barrier between the metal and atmospheric moisture, zinc rich primers provide corrosion protection by electrical means. The zinc and the steel for a tiny electrical - cathodic cell that protects the steel at the expense of the zinc. Of course the zinc primer also provides a little ‘barrier' protection as well. ZincUC provides outstanding long-term corrosion protection for steel in aggressive industrial, chemical, and marine environments. High zinc loading sacrificially protects steel against rusting and undercutting corrosion in case of coating system damage.