Poster paint
Encyclopedia
Poster paint is a tempera
Tempera
Tempera, also known as egg tempera, is a permanent fast-drying painting medium consisting of colored pigment mixed with a water-soluble binder medium . Tempera also refers to the paintings done in this medium. Tempera paintings are very long lasting, and examples from the 1st centuries AD still exist...

 paint that usually uses a type of gum-water or glue size
Sizing
Sizing or size is any one of numerous specific substances that is applied to or incorporated in other material, especially papers and textiles, to act as a protecting filler or glaze....

as its binder. It either comes in large bottles or jars or in a powdered form. It is normally a "cheap" paint used in theatrical backdrops or in grade school art classes.
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