Increase durability of 105 Epoxy Resin with WEST SYSTEM 423 Graphite Powder.423 Graphite Powder is a fine black powder that can be mixed with WEST SYSTEM 105 Epoxy Resin to produce a low-friction exterior coating with increased durability and abrasion resistance. Commonly used as a bearing surface and as a coating on rudders and centerboards. Cures to a black color.