4D PENETRANT An all-purpose and versatile industrial performance lubricant spray that works well on metals, rubber, wood, glass, painted surfaces and other substances. HARDEX® 4D penetrates quickly to loosen corroded nuts, bolts, fastener screws and sliding parts. It also works as a rust inhibitor and moisture retardant to protect and lubricate practically every mechanical parts and component. Recommended Applications: Multi-purpose lubricant for household, office and industries use. *By request/order.