410 Microlight is the ideal low-density filler. Blending with WEST SYSTEM Epoxy, it creates a light fairing compound that is easily worked and is especially suited for fairing large areas. Microlight mixes with greater ease than 407 Low-Density filler or microballoons and is approximately 30 percent 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. Tan. 4 pounds.