Tetrion TEF330 Hard As Rock Filler is a high-performance masonry repair filler designed for tough exterior applications. Ideal for use on plaster, stone, concrete, masonry, and wood, this ready-mixed filler provides a super-tough solution for all your outdoor repair needs. It’s touch dry in just 2 hours and will not shrink or crack, ensuring a long-lasting result. The filler can be applied directly from the convenient tube, requiring no mixing or dosing. It’s reinforced with high-strength polymers, accepts screws and bolts, and is over-paintable with oil-based paints. Tetrion Hard as Rock Filler fills gaps up to 10mm in a single application and provides a smooth, durable finish for a variety of surfaces.