MB-11 is a unique combination of specialty abrasives and catalysts that makes the art of marble polishing relatively easy to implement without the need of any power tools. MB-11 marble polishing powder is designed for spot polishing of most water stains or rings from polished marble, travertine and any other calcite-based stone. Be certain to test product on a spare tile or inconspicuous area first before use as a precautionary measure. This is perfect for the Do It Yourselfer or small projects at home. All you need to do is add some water and hand buff it with a terry cloth until your stone is back to its original gloss.