West System 406 Colloidal Silica is a thickening additive used to control the viscosity of the epoxy and prevent epoxy runoff in vertical and overhead joints.
406 is a very strong filler that creates a smooth mixture ideal for general bonding and filleting. It is also our most versatile filler.
West System colloidal silica is often used in combination with other fillers to improve the strength, abrasion resistance, and consistency of fairing compounds, resulting in a tougher smoother surface. Color: off-white.
September 18, 2019
on a kit car
May 24, 2019
Great for creating a low sag epoxy mixture for filling areas where dripping epoxy would create a mess by refusing to stay where it's put.
November 5, 2018
Great stuff as are all of the West System product. However, wear a respirator when mixing. Silica is nasty stuff if you breath it in.
May 6, 2018
Works as advertised
January 14, 2014
Great flexibility moving from adhesive to filler.
September 9, 2013
Easy to use, did the job well. Hopefully will last for years and years!
June 19, 2008
Makes a great filler for bonding wood parts together if used very sparingly in the epoxy. Do not advise opening the tube in a windy place. It is so light that it will blow in the wind like wheat chaff.
June 8, 2008
I used this mixed with epoxy resin to repair blisters on my boat. Even though it is extremely fine like talcum powder, it still mixed with the resin well and was easy to work out the clumps to form a consistent paste.
June 5, 2008
I use it as an adhesive filler in West System epoxy for joining wood parts.
March 24, 2008
Great filler. I used it to smooth out the fillet transition in a paddle I built.