West System 407 Low-Density FillerWest System 407 Low Density filler is excellent for creating a blended microballoon based filler with 105 Resin Epoxy. Great for fairing putties that are as easy to sand as they are to carve. On a strength to weight basis this is a reasonably strong epoxy filler. Cures in a dark red/brown color.407 Low Density Filler is excellent for bonding with fillets with epoxy and fairing with epoxy. Superior at filling voids, gap filling, and being easily sanded. Increases joint bonding area and acts as a structural brace between parts. Finishes in a smooth yet strong surface.The 407 Low Density filler is a Fairing epoxy filler. Once cured it has a light and easy to sand surface. Great for cosmetic or surface applications such as filling, flairing, or shaping. All faired surfaces should be sealed with an epoxy before painting. Click here to download 407 Low Density Filler Safety Data Sheet