Laying up the hull over a male mold, or plug like the one above is still the quickest, most economical solution for one-off, state-of-the-art hulls.

by Nick Nicholson

Most of us have boats built of fiberglass, laid up in female molds as part of a production boatbuilding process. We have a vague idea that the hard outer surface is made of gelcoat, that the reinforcing material is probably glass fiber, and the resin used is most likely polyester. Beyond that, our knowledge of the boatbuilding process approaches zero.

In small shops around the world—sometimes converted warehouses, sometimes surgically-clean purpose-built facilities—custom boatbuilders test the boundaries of technology in a way that no production builder can. They may speak English, Italian, Spanish, or Swedish but they share certain common characteristics: a lack of fear of the unknown, complete inability…