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Silica Thickener

This material is also referred to as colloidal or fumed silica, and is an excellent thixotropic agent which is used to control the viscosity of mixed epoxy systems.

Silica can be used alone for a very smooth, non-sagging, high strength mixture or combined with fillers or fibers to make them non-sagging. A 5-quart quantity of Silica Thickener when combined with 1 gallon of mixed epoxy/hardener, will produce about 1.75 gallons of a non-sagging firm paste.

Alternatively use SilverTip GelMagic for ease-of-use.


Fillers FAQ

The SilverTip line of pre-filled epoxy compounds are premium products that offer the following benefits over "homebrewing" your own epoxy compounds:

- Filler load levels have been optimized and tested for the highest performance.

- The compounds are mixed under a vacuum leading to a buttery smooth bubble-free mixture.

- A longer working time is possible as pot lifetime is not lost measuring and mixing in the fillers.

- Consistency in every batch.

Silica thickener is a thixotropic filler that can be added to liquid epoxies to make a non-sagging paste. Silica thickener can be used with our General Purpose Epoxy, Cold Cure Epoxy, or SB-112, to create gap-filling adhesives.

Homebrewing your own epoxy compounds instead of using the SilverTip line of ready-to-use epoxy compounds involves mixing various fillers into a mixed batch of one of our liquid epoxies. Below are some guidelines for creating common compounds using System Three General Purpose Epoxy, Cold Cure, SilverTip Epoxy, Clear Coat, and SB-112 Liquid epoxies.


1 cup of Silica Thickener to 6 oz of mixed epoxy.


3/4 cup of Wood Flour to 6 oz of mixed epoxy.

Fairing Compound:

1/2 cup of Silica Thickener + cup of Glass Microspheres to 6 oz of mixed epoxy.

Filleting Compound:

1 cup of Wood Flour to 6 oz of mixed epoxy.

Playdough-like Putty:

3 cups of Glass Microspheres to 6 oz of mixed epoxy.

For further detail on mixing and applying compounds, please refer to our Whitepapers.