The difference between oil paint and plastic paint
Plastic is an bi-product from Petroleum Oil refinement. The many different Plastic Resins such as ABS and PVC are bi-products. There are many things you would never have without Oil. However, many of the products which come from Petroleum Oil, can also be refined from Animal and Plant Oils. Changing the chemistry of something from Animal and Vegetable Oils, can mimic something made from Petroleum Oil. I.e: Margarine, a vegetable Oil, is one of those which has just one molecular change to become a Plastic, usually, a bi-product of Petroleum Oil. Well, there's more to it than that, but you get the idea.