3M 05917 Weld-Thru Coating II - 12.75 oz. Protects bare metal panels and parts from corrosion after welding Zinc base draws away contact corrosion, leaving substrates strong Convenient aerosol spray application Dries in as little as 5 minutes before MIG welding for efficient throughput Formulated for minimum weld spatter, helping prevent shop damage Accepts 3M Rust Fighter-I (PN 08892) and other 3M coatings on non-weld metal surfaces