BS”D
I have used it to cover scratches on painted metal and I find it as good as appliance or auto touch-up paint so long as I use black or white (colors which are available thanks to the teenage “goth” mishegoss). As a card-carrying frumyak I don’t buy any metal goods in any color besides those 2 so I have never had any experience using custom colors to touch up fancy appliances, bikes or whatever.