AGCO Challenger Primer Grey 400ml Aerosol OEM 3931666M7The AGCO 3931666M7 Challenger Primer Grey 400ml aerosol is a professional grade primer designed to prepare metal surfaces before topcoat application on tractors and agricultural equipment. It promotes strong paint adhesion while helping to protect against corrosion and surface wear. Formulated with a quick drying, well balanced consistency, this 400ml aerosol provides smooth, even coverage for small repairs and preparation work. It ensures optimal