


🛠️ Elevate your epoxy game—because every detail counts!
West System 406-7 Colloidal Silica is a high-viscosity epoxy additive designed to control flow and prevent runoff in challenging vertical and overhead joints. It enhances the strength, abrasion resistance, and consistency of epoxy fairing compounds, curing to a subtle off-white color. Ideal for marine and woodworking applications, this 5.5oz bottle is a professional favorite with a 4.9-star rating.



















| ASIN | B005150RUW |
| Best Sellers Rank | #174,509 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #938 in Epoxy Adhesives |
| Brand | WEST SYSTEM |
| Colour | off-white |
| Customer Reviews | 4.9 4.9 out of 5 stars (79) |
| Date First Available | 9 August 2012 |
| Full Cure Time | 24 Hours |
| Generic Name | MARINE ACCESSORIES |
| Global Trade Identification Number | 00811343011505 |
| Included Components | FILLER COLLOIDAL SILICA 5.5 OZ |
| Item Dimensions LxWxH | 53.3 x 40.6 x 28.6 Centimeters |
| Item Form | Liquid |
| Item Height | 11.25 Inches |
| Item Package Quantity | 1 |
| Item Volume | 5.5 Fluid Ounces |
| Item Weight | 156 g |
| Item Width | 16 Inches |
| Item model number | 406-7 |
| Manufacturer | WEST SYSTEM |
| Material | Colloidal Silica |
| Model number | 406-7 |
| Net Quantity | 5.5 Grams |
| Number of Memory Sticks | 1 |
| Number of Pieces | 1 |
| Package Information | Bottle |
| Product Dimensions | 53.34 x 40.64 x 28.58 cm; 155.92 g |
| Special Feature | Controllable viscosity, Prevention of epoxy runoff, Improved strength and consistency of fairing compounds |
| Specific Uses For Product | Woodworking |
| UPC | 811343011505 783847056576 |
| Viscosity | High |
| Viscosity Level | High |
| Water Resistance Level | Water Resistant |
A**S
Great filler from west system A++++++
M**.
This stuff works great!! It’s not easy to mix into the epoxy, it’s so insanely light, it just floats away if you’re not very very careful!! Add a little at a time, mix inside a garage or somewhere the wind can’t get to the mixing bowl. Once it’s mixed in, it does a great job thickening up the epoxy. Great for vertical surfaces as it really holds upright well once mixed to the proper thickness.
M**E
Works well for fairing, very strong
T**U
I used this to thicken the epoxy so it wouldn't run down through large cracks and nail holes in a rustic oak floor. Unthickened, the epoxy would disappear as quickly as I could inject it. This is a great system. It's very easy to mix this in until you get the desired thickness. I spread it on with a stick, smashing it down into the holes.
S**N
The West System Silica additive worked great for filling the small gap that I had after installing the wood floor in my boat. It exceeded my expectations.
Trustpilot
4 days ago
1 month ago