Pettit Epoxy Primer 4100/4101 is a heavy-duty, high build, two component epoxy-polyamide coating for use where maximum resistance to fresh or salt water is required. The complete coating system is resistant to water, many industrial chemical fumes, and very humid environments. It is ideally suited to many commercial and pleasure craft applications and has excellent durability in exterior exposures, although, like most epoxies, it will chalk if not topcoated.