A special, very low density powder which is half the weight of Glass Bubbles. It is best used with Blue Gee super epoxy, roughly in volumetric proportions of 3 parts powder to one of mixed Epoxy. The cured solid is extremely light weight and may be carved like boxwood, sanded to a super fine finish, or worked with any manner of hand tools.It is unique as a waterproof epoxy filler additive, having delightful and unique working properties.