Heavy, naphtha rubber-solvent based, modified thermoplastic liquid coating. It dries to a durable, flexible, rubber-like protective coating.LOCTITE SF F720 (known as LOCTITE COLOR GUARD COATING) is a yellow, blue, black or red, heavy, naphtha rubber-solvent based, modified thermoplastic liquid coating. It dries to a durable, flexible, rubber-like protective coating. Its used on equipment handles, electrical connections, pipe hangers, battery terminals, etc. It has an operating temperature range of +30 °F to +200 °F (-35 °C to +95 °C).