407 Low-Density filler is a blended microballoon-based filler added to epoxy resin/hardener to make fairing putties that are easy to sand or carve. This epoxy filler is reasonably strong on a strength-to-weight basis. Cures with epoxy to a dark red/brown color. Color: dark red-brown. Please note: Delivery of West System Epoxy products within Ireland only. If a colour is out of stock, contact us directly and we can try and get it for you in the shortest delays.