This new and faster formula works in seconds, and has been extensively tested, formulated and improved. Using Metal Burnishing fluid you can naturally weather and rust white metal tracks, such as those from AK-Interactive or Friulmodel. Simply dip the tracks into the Metal Burnishing fluid for a few second, and the metal will darken and seem to rust quickly, easily and effortlessly. You can use different dilutions and lengths of soak time to vary the effects on your models. With this new product, you get results better than you're used to with AK-Interactive's previous formula, all while using less product.