Angelus 2-Hard is ideal for painting plastic or other hard surfaces. When mixed with Angelus Acrylic Paints, it will allow the paint to adhere to non-porous surfaces such as plastic or glass. 2-Hard promotes adhesion and film hardness. Mix with Angelus Acrylic Paints: 50% 2-Hard for flexible surfaces and 75% 2-Hard for rigid surfaces. Apply multiple thin coats until you obtain full and even coverage, and then allow to dry for 48 hours.