Montana Acrylic Paint refill 25ml Non-toxic Water based Multi-surface 24 colour range Iron Curtain The Montana Acrylic refills are made from a high quality, non toxic water based paint and is suited for everything from refilling empty markers to using with airbrushes and can even be combined with its correlative colour from the Montana Gold range. The Acrylic Paint is engineered to be compatible with most surfaces such as wood, canvas, glass, concrete and metal.