Job Description:

• 1) Builds up layers of fiberglass and resin over plug to form molds for plastic product sections or to be used in casting concrete products, using handtools and portable power tools: Fills cracks, depressions, and holes on plug surface with plastic filler material and sandpapers plug to smooth surface.

• 2) Applies and buffs wax on plug to obtain glossy surface.

• 3) Brushes surface of plug with water-soluble parting agent to facilitate removal of mold.

• 4) Covers plug with fiberglass cloth and trims off excess cloth with shears.

• 5) Mixes specified proportions of resin and catalyst and brushes mixture on cloth.

• 6) Works mixture into cloth with hands and squeegee to remove air bubbles and to smooth surface.

• 7) Examines layer of fiberglass and resin after hardening for rough spots and air bubbles and sandpapers defective areas.

• 8) Laminates additional layers of fiberglass to initial layer to obtain mold of specified thickness.

• 9) Removes plug from mold, using wooden tool and airhose.

• 10) Trims excess fiberglass from edge of mold with knife.

• 11) Inspects completed mold for surface defects.

• 12) May bond mold to tubular holding device with resin-saturated fiberglass strips.

• 13) May repair and modify fiberglass molds, using handtools.