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503 Gray Pigment

503 Gray Pigment is an epoxy-based liquid colorant used to tint the epoxy mixture gray, providing an even, gray color base for the final finish system. Colored surfaces also tend to highlight flaws and imperfections. Cured, pigmented epoxy surfaces are not final finish surfaces but require an additional paint or UV filter coating for ultraviolet protection. You can blend it into any WEST SYSTEM® 105 Epoxy Resin®/200 Series Hardener combination, G/flex® 650, or G/5® Five-Minute Adhesive.

Designed for:

  • Color Modification
503 Gray Pigment


Pigments can be used for:

  • Fiberglass Repairs
  • Colored Castings
  • Highlight Epoxy-Coated Surfaces
  • Base Coat for Paint


  • Color | Gray
  • Pigment suspend in Epoxy Resin


  • 4 fl oz of 503 will modify up to 1.5 gal of mixed epoxy
    • 1 tsp | 8 fl oz epoxy

Product Size:

  • 503 | 4 fl 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