3M Platinum filler is a professional lightweight body filler with outstanding adhesion to properly prepared steel, galvanized steel, aluminum, E-coat, sheet molded compound (SMC) and fiberglass reinforced polyester (FRP). It is formulated with tack free, stain free resin and offers long lasting results on most base coat/clear coat and waterborne paint systems. 3M Platinum filler is a premium choice for filling small dents, dings, gouges and other cosmetic imperfections. Auto body craftsmen will appreciate its super creamy, smooth texture that mixes and spreads with ease. Moreover, the formula is vacuum processed to minimize pinholes for the smoothest possible results. Manufactured with the highest quality ingredients, 3M Platinum filler delivers superior results when filling on many different surfaces, including many industrial and architectural surfaces needing minor repairs. Since 1998, most major car and truck makes have been constructed of double sided galvanized steel. These specialized metals require a body filler to have a built-in adhesion promoter that "bites" into the metal. Specially formulated with adhesion promoters for maximum adhesion, 3M Platinum filler produces an unyielding grip to the surface, even on galvanized steel. Platinum filler is stain free/tack free and is perfect for use under basecoat and clear coat systems. This resin rich body filler will "wet-out" sand scratches completely and provide superior mechanical adhesion, allowing technicians to apply it to cured sanded 2K primers with confidence. This eliminates the need to sand down to the bare metal, preventing the risk of corrosion and rework. 3M Platinum filler must be mixed with a hardener before use (hardeners sold separately), in the amount of 2% hardener by weight. Following proper surface preparation, apply a thin layer using firm pressure to ensure maximum adhesion, then apply additional layers to buildup surface. Maximum filler thickness should not exceed 1/4 in. It is ready to sand in only 20 min and ready for paint or primer in 45 min. We recommend 3M ultimate 2K urethane primer or another quality primer. Follow paint manufacturer's instructions for finishing. 3M Platinum filler is ideal for lasting repairs on many different surfaces, including bare metal and allows auto body professionals to expertly recreate OEM appearances. Its superior adhesion, ease of use, quick cure time and versatility all combine to create a premium body filler. This product is one of the ways 3M supplies scientific expertise to boost performance in the automotive industry.