A hollow mold has a small amount of resin (usually quick setting) poured in and is rotated by hand to ensure that the entire inside surface is coated. Often several coats are required to get an adequate and even thickness.
"Casting liquid is poured into a mold and then automatically turned in two opposing directions which smoothly distributes the casting medium." -plastermaster.com
Mother Mold / Mold Jacket
Here are a few references to get you started:
evan4218's list of molding and casting suppliers
[*]Reynolds Advanced Materials Howto Guide
[*]Smoothon's Youtube Library
[*]TIM ALLEN's Fiberglass 101 video
[*]SEEKER's guide to heat forming armor WITHOUT a vac table
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