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The process for “free-forming” a fabric mold — for all kinds of creative, ripply results — is a little different but will include many of the same steps as basic fabric forming. The biggest difference is that you will be working on the outside of the mold first.
Fiberglass has been used in the precast industry for many years. The use of resin-and-glass mats to make master-mold plugs, keeper molds to hold the shape of rubber molds, and good old-fashioned production molds is standard in the industry.
