WD-40 18 oz. Aerosol Big Blast Lubricant. WD-40 big blast is the ultimate solution for large-scale maintenance tasks. Equipped with a wide-area spray nozzle, it delivers the trusted WD-40 formula quickly and efficiently over extensive surfaces. WD-40 Big Blast protects metal from rust and corrosion, penetrates stuck parts, displaces moisture, and lubricatesalmost anything.