General Finishes Milk Paint that is a durable, pre-mixed acrylic paint formulated for interior and exterior projects. It can be used alone or layered over another Milk Paint color, Glaze, or Pearl Effects for a decorative finish. Milk paints are compatible with existing Finishes, stains, and other paints. It will adhere to a variety of surfaces including wood, fiberglass, PVC, primed steel, vinyl, and most composite materials. Always test a small area to ensure adhesion.