Intensively calibrated in our Test centers, 1950 siaspeed excels on any challenging surface, including: primed, filled, painted, and clear coated. Its innovative abrasive structure utilizes the very best raw materials, and an ingenious stearate coating to reduce clogging and maximize stock removal. The net result is a fully harmonized system that guarantees trouble-free use, reduced sanding times, longer life cycles, and ultimately, reduced costs.