RC Fabrications Custom Fiberglass Fabrication Overview
Plug is the actual part that is used to make the mold.
This can be made out almost anything that will hold a shape to pull a mold off. This is usually where a lot of time and money is spent.
Mold is the piece that is made off of the plug to make the actual part. A mold cost can vary depending on the required use.
Finished part is made from the mold.