Usage: step apply 1 or 2 layer of any colour uv gel nail polish( you can also try other base colours) cured with uv or led lamp. Step apply a thin layer topcoat cure with uv or led lamp. Step4- use a nail brush to clean away the extra powder on your nails. Step5-. Apply a thin layer topcoat cure with uv or led lamp. (Recommend to apply chrome powder 2 times to get a more smooth.