best way to apply touch up paint

I just got my touch up paint in the mail and what is the best way to apply it? I did a search and I found that a brush is bad and a toothpick is better. what about a sponge applicator?
 
Has anyone applied touch up paint yet? I'v got a nasty scratch on the rear bumper and like MangoSpeedG I want it to look good.
 
exactly.....go to a art store and buy a good brush...a very fine one......dab a bit of paint to fill the hole...let it dry, do it again, let it dry....then wax it...http://www.mothers.com sells a kit to do this
 
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