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2005-12-24 · www.cstsales.com Making a Fiberglass Mold Step 1 Step 2 Step 3 Continue to Step 4... Fiberglass molds are commonly used to make multiple copies of a part which may have a complex shape. Some of the advantages of using a fiberglass mold are: they are easy to make, the materials are inexpensive, they will last for many years and can be used to