to make large smooth fibreglass panels for a boat designed for plywood
construction, boatbuilder TF Jones made the fibreglass panels on sheets of
formica, the stuff used for countertops. fibreglass panels can be made
thin and flexible to bend into a curved shape, then stiffened by adding
more fibreglass.

plastic is a good parting barrier for curing resins. I've put plastic
garbage bags under fibreglass and other resins and adhesives to keep them
from sticking to the work surface. for small jobs you could tape or staple
plastic to any smooth surface, eg plywood. to avoid wrinkles use thicker
plastic. If there is any printing on the plastic it will stick to the
cured resin so put the printed side down.

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