3M Marine Premium Filler repairs defects in fiberglass, wood, aluminum and steel for applications both above and below the waterline. This filler is a unique vinyl ester formula that offers resistance to water absorption.A Filler Designed for Marine Use 3M Marine Premium Filler is designed for marine filling and fairing applications. Offering outstanding resistance to water absorption, our unique vinyl ester filler works both above and below the waterline. Besides quality performance, the filler offers easy spreading and sanding. Once cured and sanded the filler can be gel coated. A Versatile Product to Repair Many Materials Our marine premium filler adheres to a wide range of surfaces, including fiberglass, wood, aluminum and steel. It has been formulated with a vinyl ester resin to enhance its water resistance and bonding properties above and below the water line.