Epoxy Fillers and Thickeners
Epoxy systems properly mixed are intended for both coating and fiberglassing. When mixed right out of the containers, most systems are "unfilled" and are too thin to be used for gap filling, fairing, or filleting. This is when you need to add an appropriate filler.
Colloidal Silica and Cab-o-Sil
Cabosil, or as West System calls it, Colloidal silica, is thickening additive used to control the viscosity of the epoxy and prevent epoxy runoff in vertical and overhead joints. 406 is a very strong filler that creates a smooth mixture, ideal for general bonding and filleting. It is also our most versatile filler. Often used in combination with other fillers, it can be used to improve the improve strength, abrasion resistance, and consistency of fairing compounds, resulting in a tougher, smoother surface. Color: off-white.
Wood Fibers or Filleting Blend
This strong, wood-toned filler is good for use in glue joints and fillets on naturally finished wood. It mixes easily with epoxy and lets you create fillets that are smooth and require little sanding. Its color is a consistent brown, so 405 can be used to modify the shade of other epoxy fillers.
Low Density, Microlight and Phenolic Microballoon Fillers
For use when low density, light weight sandable paint-ready surfaces are required, i.e. when fairing. Microlight is the ideal low-density filler for creating a light, easily-worked fairing compound especially suited for fairing large areas. Microlight mixes with greater ease than 407 Low-Density filler or microballoons and is approximately 30% easier to sand. It feathers to a fine edge and is also more economical for large fairing jobs. Not recommended under dark paint or other surfaces subject to high temperatures. Cures to a tan color.
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