Colloidal silica is an epoxy thickening additive used to control the viscosity of the epoxy and prevent epoxy runoff in vertical and overhead joints. This is a very strong filler that creates a smooth mixture, ideal for general epoxy bonding and filleting.

Brand Name: West System
Sub Brand: 406 Filler
Adhesion Strength: High Strength
Material: Colloidal Silica
Product Type: Adhesive Filler
Container Size: 1.7 oz
UV Resistant: No
Packaging Type: Can
Color: Off-White
Solvent Resistant: No
Indoor or Outdoor: Indoor and Outdoor
Flammable: No
Full Cure Time: 15 hr
Recommended Surface: Wood and metal
Product Form: Powder
406 can be used to improve strength, abrasion resistance, and consistency of epoxy fairing compounds.