Bondo All-purpose putty is a professional strength, versatile filler for repairing interior and exterior surfaces around the home. This fast curing two-part filler allows you to make high-quality, long-lasting repairs to metal, masonry, concrete, wood, plastic, drywall and more. The non-shrinking filler features a thicker formulation that makes it ideal for repairing vertical surfaces.Two-part filler bonds to broad range of surfaces for permanent, non-shrink repairsCures fast, sandable in 15 mins for fast same-day repairsLight gray when mixed, helping blend with surfaces for consistent appearanceFully paintable and stainable