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  Polyester Resins, Custom Gel Coat, Fiberglass & Custom Colorants
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Castolite provides materials and systems primarily for Casting, Embedding, Laminating, Molding and Coating.

We also provide custom marine grade gel coat for boats, water slides, pools and more.

Our custom colorant department can color match and produce colorants for a wide array of resin systems.

Need fiberglass for repair or custom fabrication? We also stock numerous grades and forms of fiberglass.

Our Mission

Castolite is the leading provider of liquid polyester resin formulas, marine grade gel coats, custom colorant producer and supplier of fiberglass materials. We provide expert advice and guidance to our customers to ensure superb results that will last a lifetime.

Contact Information

Castolite prefers telephone contact, as the many varied products are tailored to specific applications.  The expert employees at Castolite will ensure that the right products are delivered to meet each customer's specific need.  Office hours are from 8am - 4:30 pm M-F Central Time Zone.

Postal address
PO Box 190, Lemont, IL. 60439
Electronic mail
General Information: info@castolite.com
Sales: 1-708-224-9980
Customer Support: 1-708-224-9980
Webmaster: info@castolite.com
Send mail to info@castolite.com with questions or comments about this web site.
Last modified: 11/07/2023

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