Tetrion Powerfil Filler is a rapid-cure, super strong filler which sets 5x harder than concrete in 15 minutes. Powerfil technology enables the user to fill holes, horizontal or vertical, without 'slumping'. Its super smooth finish can be drilled, painted (with all paint types), easily spread, screwable, and shaped The versatile formulation is also perfect for filling small holes, hairline cracks and grain or knotholes in new wood. Tetrion Powerfil can be used on most hard surfaces, is resistant to vibration, will not shrink or crack and cures fully to any depth in one application. Ideal for large and small jobs, both indoor and outdoor, which require a heavy-duty filler. Suitable for metals, wood, stone and most plastics.