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407 Low-Density filler is a blended microballoon-based
filler used to make fairing putties that are easy to sand or
carve. Reasonably strong on a strength-to-weight basis.
Cures to a dark red/brown color. Use 407 Low Density Filler
to thicken the epoxy mixture to the desired consistency. The
thickness of a mixture required for a particular job is
controlled by the amount of filler added. There is no
strict formula or measuring involved-use your eye to judge
what consistency will work best.