TOUPRET® Exterior Rock Solid Repair Filler is extremely durable and will adhere to any substrate for filling and repairs with no depth limit. It sets to a rock-hard finish and can be overcoated in 24 hours. Suitable for new or renovated substrates, either unpainted or painted: gypsum plaster, old painted surfaces, cement, concrete, breeze blocks, bricks, stone, glass and glazed tiles. Overcoat with any water-based masonry paint or mineral paint. If using polyurethane or epoxy solvent-based paints, first prime with water-based exterior paint.