Question: what is the difference between acrylic colours and poster colours?
Answer: Poster paint is an opaque water-based paint. Like water-colour, it can be softened with water once dry. Acrylic, on the other hand, cannot be removed or manipulated once dry. ... Acrylic, applied, straight from the tube, dries rather like plastic so is very different from poster paint and the 2 should not be mixed.