[dougo]

I polished, cleaned the caps, then used painters vinyl tape (not wide, about 1/4, or 1/2 wide) to mask off the edges (vinyl tape is the the easiest to mask, it's flexible, and you get a clean edge), then roughen the area to paint with a course pad (3M pad), clean the area to be painted, then masked off the rest of the caps/area that I did not want to paint.

I painted the black first, let that set. Then, painted the red second. I used paint thinner around the edges of the red - a cloth, finger tip to remove any over spray (best to do this when the red is still wet). Obviously you're going with a different color, but you get the picture.

I spent a lot of time prepping, masking to get good, clean lines. I also used good paint with a good tip (rattle can). I have a local automotive shop that will mix good paint in a can, with a good tip.

I had an NOS cap to use as a reference and to also match paint colors.

So - if you want to rattle can - that's what I did. Here are the pics of how they came out.