Once the release agent and gelcoat are applied, layers of fiberglass and resin are laid-up onto the surface.

Air bubbles, if left in the curing resin, would significantly reduce the strength of the finished mold.

The fiberglass spray lay-up process is also used to produce molds, and can provide good filling of corners and cavities where a glass mat or weave may prove to be too stiff.

Once the final layers of fiberglass are applied to the mold, the resin is allowed to set up and cure.

Once completed and cured, the component is separated from the mold using wedges, compressed air or both.