Cast Iron is a deep charcoal gray, similar to the color Ash by Fusion. Cast Iron has warmer chocolate undertones, while Ash has navy blue undertones. The Fusion Mineral Paint comes in a 500mL (16.9oz) bottle, which covers approximately 75 square feet. The paint has a top coat built into it, so a top coat is not necessarily needed. This paint is indoor/outdoor and can be used on a variety of materials.