RUST-BLOCKâ¢ prevents your items from rusting for up to 1 year. RUST-BLOCKâ¢ is a revolutionary water based rust inhibitor that works on all ferrous metals. RUST-BLOCKâ¢ is ideal for home or shop use. Use it to protect your tools, auto parts, hardware, gardening gear and more. Also, it is ideal for industrial use. RUST-BLOCKâ¢ is non-corrosive, non-flammable and biodegradable. When you are ready to remove the invisible coating, simply rinse it away with warm water. Then, your item is ready to paint, primer or oil. RUST-BLOCKâ¢ is now available in aerosol form exclusively through OâReilly Auto Parts.