Acrylic paint is composed of 3 materials. They are the acrylic which acts as the glue, the pigment that adds the color, and the solvent which evaporates causing the paint to dry. The pigment is the most expensive ingredient, and we’ve seen cheap paints that have 1/10th the pigment as the good quality paints we recommend. Since all the color comes from the pigment, the cheap paint will require multiple coats compared to a single coat of the good paint