Related Clues:

• Create like 25-Down
• Produce a portrait
• Muralist's need
• Slap about fashionable colouring
• The stuff of masterpieces (2 words)
• Coat that's hard to take off
• Create on canvas
• Oil painter's primer
• Home Depot department
• Graffiti supply
• White paint mixture traditionally used as a substrate for painting
• Painter’s base layer
• Item used by 23 Across
• Colour isn't on front of package
• Medium for Rembrandt