Adhesive Fillers vs. Fairing Fillers
West System Fillers are used to thicken the basic resin/hardener mixture for specific applications. Each filler possesses a unique set of physical characteristics, but they can be generally categorized as either Adhesive (high-density) or Fairing (low-density).
Adhesive filler mixtures (Model# 403, 404, 405, 406) cure to a strong, hard-to-sand plastic useful in structural applications like bonding, filleting and hardware bonding.
Fairing filler mixtures (Model #407, 410) cure to light, easily sandable material that is generally used for cosmetic or surface applications like shaping, filling or fairing.