Cottrell Introduces New Pavco SuperSeal Post Lock Cottrell has introduced a new Pavco SuperSeal Post Lock on all new equipment. The Pavco SuperSeal is the most corrosion resistant conversion coating yet to be introduced to the metal finishing industry. Pavco SuperSeal can provide over 500 hours of salt spray protection to red rust when applied over zinc plated and chromated parts. Look for more Cottrell components to have the Pavco SuperSeal!