Glass bead media is a perfect option for steel, stone, wood, fiberglass, aluminum and concrete.
It is a fairly aggressive media that leaves behind less than 2% embedment and no dust. Crushed glass blasting media is also extremely cost effective, usually made from recycled bottles, and can generally be reused several times before replacing.
Glass beads are also silica free and inert, so they are environmentally friendly and will not leave any unwanted residue on your substrate. It is rated around a 6 on the Mohs Hardness scale, making it hard enough to cut through rust and leave a perfect anchor pattern for coating applications.
