West System® 403 Microfibers. A "fine" fiber blend. Use to thicken epoxy blended resin/hardener and create a multi-purpose adhesive. Designed for wood bonding, adhesion, gap filling and penetrating wood fibers. Can be blended into any West System® 105 Epoxy Resin®/200 Series Hardener combination, West System® G/flex® 650 or West System® G/5® Five Minute Adhesive. Cures to an off-white color. Off-White. 20 oz.