As used in this act:
a. "Customer" means any person who causes or caused a molder to fabricate, cast or otherwise make a mold, die or form, or who causes or caused a molder to use a mold, die or form in the manufacture or assembly of products.
b. "Molder" means any person who fabricates, casts or otherwise makes a mold, die or form to produce plastic products, or who uses a mold, die or form in the manufacture or assembly of plastic products.