West System Microlight FillerThe ideal low density filler for creating a light, easily worked fairing compound especially suited for fairing large areas. Mixes with greater ease than 407 Low Density filler or micro balloons and is approximately 30% easier to sand. It feathers to a fine edge and is also more economical for large fairing jobs. Not recommended under dark paint or other surfaces subject to high temperatures. Cures to a tan color.