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420 Aluminum Powder

420 Aluminum Powder will increase the hardness and abrasion resistance of the coated surface and improve its moisture resistance. 420 provides limited protection from ultraviolet light in areas that will not be protected with other coatings and can be used as a base for subsequent painting. Add to any mixed WEST SYSTEM® 105/200 Series Hardener combination.

Designed for:

  • Moisture Resistance
  • Abrasion Resistance
  • Color Modifications
Aluminum Powder


Create an abrasion and moisture-resistant surface in:

  • Fiberglass Repairs
  • Reusable Mold Surfaces
  • Boat Bottom Fortification
  • Composite Aluminum Castings


  • Color | Metallic Gray
  • Cures to Metallic Gray
  • Fine Aluminum Powder


  • 36 oz of 420 will modify up to 5 gal of mixed epoxy
    • 5-10% by volume (1.5 tbsp) | 8 fl oz epoxy for coating applications

Product Size:

  • 420 | 36 oz



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.

Fiberglass Repairs

Recently we revised our most popular instruction manual, Fiberglass Boat Repair & Maintenance, bringing it up to date and expanding it to 146 pages. It contains the very latest fiberglass repair techniques and features complete sections devoted to repairing cracks, holes, damaged skins, cores, keels, and rudders, installing hardware, installing teak veneer decks, gelcoat blister repair and prevention, and final fairing and finishing.

Using WEST SYSTEMFillers & Additives