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A paint pen hands down is the easiest, cleanest way to paint the letters. I just did mine about two years ago and it is very easy compared to a brush or anything else I've tried to use in the past. I got mine at a local craft type store. You break the seal on the pen and depress the tip and paint starts to flow. It was very easy to get the paint to flow to where it did not leave any marks. You still have to be a little careful but it is 10 times easier than using a brush.