• Helps prevent sag or run off on vertical surfaces
  • Used as an adhesive or putty
  • Can be used with other fillers such as glass bubbles and/or milled fibers
  • Compatible with polyester, vinyl ester and epoxy resins.
  • Also known as Cabosil or Aerosil.
  • Ships within one business day


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Sku: 15724
Fumed silica is an extremely fine powder used as a thickening agent. It is often used with polyester, vinyl ester or epoxy resins. It is great for making fillet putty, thickening epoxy for a better glue consistency, and for use below the waterline. Resin drains off a vertical surface but by adding Fumed Silica, the resin can be made to stay in place.

Fumed Silica can also be mixed with milled fibers for structural putty and/ or glass microspheres/bubbles for a sandable putty. It is added to the resin at approximately a one-to-one ratio by volume. You may use more or less to suit your application.