Your Cart is Empty

Glass Microspheres

These bulking agents are hollow, clear microscopic spheres that make a low cost, low density filler. Added to epoxy resin and hardener mix, they make a good, heat-resistant, light-weight fairing compound with good compressive strength. Mixture can be blended with a small amount of Silica Thickener to prevent sagging.

Not recommended for glue.

Alternatively use SilverTip QuikFair for ease-of-use.


Fillers FAQ

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.

Glass microspheres are a low-density bulking filler that can be added to liquid epoxies to make fairing compounds and putties. Glass microspheres can be used with our General-Purpose Epoxy, Cold Cure Epoxy, or SB-112.

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.