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.