3M™ Marine Premium Filler is a unique vinylester formulation designed for marine filling and fairing applications above or below the waterline. 3M™ Marine Premium Filler is a unique and easy to sand formula designed with 3M™ Scotchlite™ Glass Bubbles. Features Excellent moisture resistance Fast curing Easy to sand Easy spreading Premixed blue creme hardener Cure Rate Working time 10 minutes, sandable in 30 minutes