Fillers and Additives

Casto-Sil

Our Casto-Sil is a white fumed silica used in the thickening of many types of resins. Use it in various levels to produce a wide range of viscosities from syrup to paste consistencies. This is an essential additive for any repair or fabrication shop.

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Glass Microballoons

Our Glass Microballoons are a commonly used additive in resin when a light-weight compound is desired. Mix them into your resin such as EP4116 or EP4117 to achieve a light-weight fairing compound that can be troweled into a radius or void. Glass microballoons will also create an easier compound to sand and machine once cured.

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Ceramic Microspheres

Our Ceramic Microspheres are used in a similar way as our Glass Microspheres. However the ceramic microspheres offer a harder and more durable cured compound when mixed with polyester resin. It will still provide a light-weight compound which can be sanded and machined. Common uses are for filling voids and making radius joints.

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Cultured Marble Dust

Cultured Marble Dust (CaCO2) is commonly used for creating very hard stone-like compounds. It is widely used for adding into resin to help create a faux marble look with the addition of various colorants. Finished products can be machined. However it can cause cured compounds to become somewhat brittle. It is off-white on color.

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Milled Fiberglass (1/32")

Milled Fiberglass is mixed with resins to create putty and patching formulas used for filling holes, cracks, and dents on car bodies, tanks, boats, floors or anything else needing repair where added strength is needed.

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Metal Powders

Together with our longtime partner Metalpowdersusa, we are pleased to offer 10 atomized metal powders for your projects. Our metal powders are used in combination with our Polyester resins in creating a wide range of casting and coatings. For sizes, pricing and technical information please visit:

Send mail to info@castolite.com with questions or comments about this web site.
Last modified: 03/22/2024

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