- Round synthetic marker tip - Lightfast and water-resistant acrylic paint - Designed for indoor or outdoor mural painting - Non-toxic formulation The Chroma Mural Paint Marker Sets provide a simple and fun way to paint outdoor murals. Designed with the muralist in mind, these markers are lightfast and water-resistant. The artist grade paint markers have incredible coverage and wash up easily with soap and water. To use, simply unscrew the top and apply the paint directly to paper. Adjust your grip and angle to change the paint strokes. Before working on your larger piece, we recommend testing the paint on a smaller surface to ensure optimal results.