406 Colloidal Silica
A feather-weight thixotropic powder, which is used to thicken resins & gelcoats.
Add more to create a non-sagging filler that is lightweight and very hard.
Also used to control the viscosity of resin and prevent runoff in vertical surfaces. Colloidal silica creates a smooth mixture, ideal for general bonding and filleting, so it's a very versatile filler. Often used in combination with other fillers, it can improve strength, abrasion resistance, and consistency of fairing compounds, resulting in a tougher, smoother surface.
Add 3% to 8% by weight to the resin / hardener mix.
Colour off-white
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