Ospho

Ospho is a legendary rust-inhibitor and metal primer that has been trusted by mariners for decades to stop corrosion in its tracks. When applied to rusted surfaces, Ospho causes a chemical reaction that converts iron oxide (rust) into iron phosphate—a hard, black, inert substance that provides a perfect base for painting. It is highly effective on steel hulls, trailers, and engine components, ensuring that rust cannot spread underneath your new finish. At Freeport Marine Supply, we offer Ospho for boaters who want a proven, commercial-strength solution for metal preparation and long-term corrosion control.