This material is also referred to as colloidal silica or cab-o-sil and is an excellent thixotropic agent which is used to control the viscosity of mixed epoxy systems. Can be used alone for a very smooth, non-sagging, high strength mixture or combined with bulking or fibrous agents 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.

Silica Thickener is available in 1- and 5-quart tubs, and 10 pound bags.

Wood Flour is a fine sawdust that has been filtered so that there are no "surprise" lumps to be found, wood flour is excellent for creating glues and structural fillets. It is a fibrous filler that is also thixotropic.

To make a smoother fillet, some users add a small amount of silica thickener. A 1 quart tub of wood flour when added to a quarts of mixed epoxy and hardener will yield 1.25 quarts of a non-sagging firm paste.

Wood Flour is available in 1- and 5 quart tubs, and 50-pound bag.

In the early days, users of resin would use linen or cotton fibers to thicken the mixture to make a glue. Plastic minifibers are a much more consistent and stable product for this purpose. Plastic minifibers are fibrous, and add thixotropy.

A 5-quart tub added to 1 gallon of mixed epoxy and hardener will yield about 1.5 gallons of a non-sagging firm paste. This material is especially recommended for making a gap-filling adhesive.

Plastic Minifibers are available in 1- and 5 quart tubs, and 10 pound bags.

These bulking agents are hollow, purple-brown microscopic phenolic spheres that make a low cost low density filler. Added to epoxy resin and hardener mix by themselves, they make a good, lightweight fairing compound with good compressive strength. Blend with a small amount of silica thickener to prevent sagging. Not recommended for gluing.

We provide Phenolic Microballoons in 1- and 5-quart tubs, and 30 pound drums.

Phenolic Microballoon bulking agents and Silica Thickener pre-blended at the correct ratio for a non-sagging filleting/fairing compound. Not recommended for gluing.

Microballoon Mix can be purchased in 1- and 5-quart tubs, and 30 pound drums.

Called "Q-cells" or white microballoons, these are lightweight and tough microscopic quartz spheres. Used the same as phenolic microballoons some users prefer these because of their lighter color.

A 5-quart tub added to 2 quarts of mixed epoxy and hardener will yield about 1 gallon of filleting/ fairing compound. Silica thickener should be added to prevent sagging. Not recommended for gluing.

Quartz Microspheres are available in 1- and 5-quart tubs, and 30 pound drums.

Chopped glass strand is a ¼ inch long chopped fiberglass strand. Makes a very coarse structural filler. You must use silica thickener with this to prevent sagging.

Chopped Glass Strand is available in 1- and 5-quart tubs, and 50 pound bags.

Milled glass fiber will make a thick, jelly-like paste which is sometimes called "liquid fiberglass". The addition of silica thickener will prevent sagging or draining. Added to cosmetic fillets it will improve their tensile strength.

Milled Glass Fiber is available in 1- and 5-quart tubs, and 30 pound bags.

Use this metallic gray-black powder to make black epoxy coatings for boat bottoms. Some say that a sanded epoxy filled graphite bottom offers less water resistance. Drift boat builders add this to their bottom coatings for mar resistance.

Note: graphite is a conductor of electricity and may cause electrolysis when immersed in salt water in contact with metals.

Graphite Powder is available in 1 pound cans.