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403 Microfibres

Adhesive Filler

403 Microfibres Adhesive Filler is a fine fibre blend. Use it to thicken epoxy blended resin/hardener and create a multi-purpose adhesive. Its most popular use is for bonding wood. Epoxy thickened with microfibres has good gap-filling qualities but will still do an excellent job of wetting-out/penetrating into wood fibres. You can blend it into any WEST SYSTEM 105 Resin/200 Series Hardener combination, G/Flex Epoxy 650, or G/5 Five-Minute Adhesive.

Designed for:

  • Wood Bonding
  • Adhesion
  • Gap Filling
  • Penetrating Wood Fibres
403 Microfibres


Thicken epoxy blended resin/hardener and create a multi-purpose adhesive for:

  • Marine
  • Boat Repair
  • Bonding
  • Coating
  • Wood Joints
  • Strip Planking


  • Colour | Off-White
  • Cures to off-white colour
  • Fine fibre powder


  • 403-1 | 160g
  • 403-2 | 800g
  • 403-3 | 3.5kg
  • 403-4 | 20kg

Filler Facts


Modifying with fillers and additives makes WEST SYSTEM epoxy extremely versatile for a wide variety of bonding and coating applications. Epoxy can be thickened to the ideal consistency needed for a particular job. Epoxy thickened with adhesive (high-density) fillers strengthens structural bonds, bridges gaps, and fills voids. Epoxy thickened with fairing (low-density) fillers is easily sanded and shaped after it cures.

Bonding with Fillets

Epoxy fillets can make a bond between components even stronger than the components themselves, ensuring that loads can be transferred between structures and panels effectively, with no risk of stress fractures or other structural issues.

Using WEST SYSTEMFillers & Additives