HOME MADE PUFFY PAINT! Combine the following in a little bowl: 1 tablespoon self-rising flour a few little drops of food coloring 1 tablespoon salt Then add some water to make a nice smooth paste. Paint away on a nice thick sheet of cardboard (if you don’t have enough paint brushes use Q Tips, they work really well). Microwave the design on high for 10 – 30 seconds until the paint puffs and it’s all nice and dry. Someone said they did it for 20 seconds.