Iron powder fillers are more commonly used in resins for producing cold cast metal effects. Generally, higher amounts of metal powder are used to give a true metallic effect. This may be buffed, polished and a patina applied if required. Iron powder filler can be mixed with a variety of products including Forton, polyester, polyurethane and epoxy resins. Great for use when creating cold cast effects. Our Iron powder is a -325 mesh with an apparent medium density of 2.2 – 2.8.