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🛠️ Elevate your epoxy game—thicken, strengthen, and conquer every surface!
West System Colloidal Silica (5.5 oz) is a high-performance epoxy thickening additive designed to control viscosity, prevent runoff on vertical and overhead joints, and enhance the strength and abrasion resistance of epoxy fairing compounds. It cures to an off-white color and is ideal for woodworking and fiberglass applications, delivering professional-grade results with water-resistant durability.



















| ASIN | B005150RUW |
| Best Sellers Rank | #101,322 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #134 in Wood Filler |
| Brand Name | West System |
| Color | Off-White |
| Compatible Material | Fiberglass |
| Container Type | Aerosol Can |
| Customer Reviews | 4.9 4.9 out of 5 stars (80) |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00811343011505 |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Weight | 5.5 Ounces |
| Manufacturer | WEST SYSTEM |
| Material Type | Epoxy Resin |
| Model | 406-7 |
| Other Special Features of the Product | Controllable viscosity, Prevention of epoxy runoff, Improved strength and consistency of fairing compounds |
| Specific Uses For Product | Woodworking |
| UPC | 811343011505 783847056576 |
| Unit Count | 162.65 Milliliters |
| Viscosity | High |
| Volume | 5.5 Fluid Ounces |
| Water Resistance Level | Water Resistant |
A**S
West system the best
Great filler from west system A++++++
M**L
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.
M**.
Love this stuff, use it every were in my boat and under too! Smooth as silk and sands good to,for the 1st day or 2 .
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
3 weeks ago
4 days ago