Since the part where the white paint goes is recessed, I used liquid White acrylic. Get the good stuff from Michaels or another artist type store. The cheaper stuff is too thick and does not flow and if you thin it with water, the majority of it evaporates. Then get a small empty plastic bottle with very small hole. I bought another type of paint and dumped it just to use the bottle. Put the tip of the small bottle in the acrylic and suck up a small amount into the bottle. Since it flows nicely, you can just squeeze it into the letter 'channels'. With a steady hand it can be very accurate. I kept a couple of toothpicks on hand to guide it up to the edges of the letters. If the emblem had a silver or gold edge, a metallic sharpie type pen works great. Also, a touch up pen from a car works for the trim. Again, a steady hand is helpful.
