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Sig Micro-Balloons are expanded glass beads, microscopic in size. They are so small, they have the appearance of powdered sugar and are extremely light. They make a strong light weight putty when mixed with Sig-Ment, Sig Polyester Glass Resin, or Sig Epoxy Glue. The primary purpose of Micro Balloons is to expand and extend other adhesives in such a way that they can fill in voids or perhaps form things like wing fillets yet not be as heavy as solid glue or solid epoxy would be. You are in essence mixing in fine bubbles.
 "Sig Micro Balloons Filler, Pint Container")