A faster formula (works in seconds), and at a more competitive price. AK has extensively tested and formulated and improved this product. With their Metal Burnishing fluid, you can naturally weather and rust white metal tracks, such as those made by Friulmodel or ours. Just dip the tracks in the liquid for a few seconds and the metal will begin to appear dark and rusty very quickly, easily and effortlessly. You can vary the effect using different dilutions and varying lengths of soak. Using less product, you can achieve even better results than with our previous formula.