BodyShop Essentials BSE-P38G 5:1 2K High-Build Primer is a professional-grade automotive primer surfacer designed for collision repair shops, restoration professionals, and refinishing technicians who demand consistent results and reliable performance. This high-build urethane primer is engineered to fill sanding scratches, minor surface imperfections, and bodywork repairs while providing a smooth, uniform surface for basecoat and clearcoat application. Its 5:1 mixing ratio system ensures proper film build and durability when used with a compatible hardener (sold separately). The grey formulation offers excellent visibility during sanding and blocking stages, helping technicians identify low spots and surface inconsistencies before topcoat application. Once cured, it sands easily, allowing for reduced cycle time and improved shop efficiency. Ideal for use over properly prepared substrates including OEM finishes, body filler, fiberglass, and sanded metal surfaces. Important: This listing includes primer only. Hardener is required for activation and is sold separately.