Acrylic gouache is a modern option for painters and illustrators looking for a super flat look. This paint is matte, more opaque than traditional gouache, waterproof once dry, and acts very similarly to a fluid acrylic. The base of acrylic gouache is generally an acrylic resin, rendering it water resistant once dry. It is intermixable with other water-based media, and you retain the same high pigment qualities of a traditional gouache, but with better adhesion properties and permanence.