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Product Details

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.

Reviews for WEST System 406 Colloidal Silica

10 of 10 Reviews

September 18, 2019

yes
By rocky from green valley AZ

Verified Purchase

on a kit car

Bottom Line Yes, I would recommend to a friend

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May 24, 2019

I would purchase again
By Aaron from Wisconsin

Verified Purchase

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.

Bottom Line Yes, I would recommend to a friend

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November 5, 2018

Great Stuff
By MacDuffy from Virginia

Verified Purchase

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.

Bottom Line Yes, I would recommend to a friend

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May 6, 2018

Im a newbie at this, but it has worked well.
By Mike from Jenner, CA

Verified Purchase

Works as advertised

Bottom Line Yes, I would recommend to a friend

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January 14, 2014

Great product and inexpensive
By Jim from Overland Park

Verified Purchase

Great flexibility moving from adhesive to filler.

Bottom Line Yes, I would recommend to a friend

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September 9, 2013

Good product!
By Mooring Wood from Norman, Ok.

Verified Purchase

Easy to use, did the job well. Hopefully will last for years and years!

Bottom Line Yes, I would recommend to a friend

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June 19, 2008

Very useful for bonding wood parts
By bbkbbk from ca

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.

Bottom Line Yes, I would recommend to a friend

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June 8, 2008

Good Product
By Alaska_Av8r from Nesbit, MS

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.

Bottom Line Yes, I would recommend to a friend

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June 5, 2008

Just what the label says
By angelsgate from CA

I use it as an adhesive filler in West System epoxy for joining wood parts.

Bottom Line Yes, I would recommend to a friend

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March 24, 2008

Great Product
By El Creno from VA

Great filler. I used it to smooth out the fillet transition in a paddle I built.

Bottom Line Yes, I would recommend to a friend

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