[transmaro93]

just for touch up you can use a fine brush and you can use either really... usually if its a color like blue red yellow etc base clear will match better but if its black.. you can use a single stage black and you will not see a difference... single stage colors tend to be alot thicker before they are reduced so they are ideal for touching up... its just touching up a metallic color that was originally base clear with a single stage will show the difference..