Clean the affected area with soapy water. Use a microfiber cloth to remove any dirt, grime or dust from the chrome without scratching the fragile finish.
Sand down the area of the crack with 320-grit sandpaper. Continue to rub the sandpaper over the crack until it is flush with the surrounding area.
Apply a thin layer of liquid steel over the affected area with a small paintbrush. Continue to apply thin layers of the liquid steel until the area is flush with the surrounding chrome surface.
Allow the liquid steel to dry completely. Tape off the affected area with painter’s tape and apply spray-on chrome paint using even, back-and-forth motions.
Allow the first layer to dry completely before applying a second layer, if necessary. Allow this second layer to dry completely before continuing.
Apply a thin layer of chrome polish to the newly painted area with a microfiber cloth. Work the polish into the chrome using overlapping circles. Allow the chrome polish to haze before buffing it with a clean microfiber cloth.