I stopped by the hobby shop to get some paint for infilling the engravings on my new sammichSID kit. I got a Sharpie paint pen and now regret that choice. The result is bubbly, uneven, and in a few cases went outside the lines. It looks terrible. How should I go about redoing this? I imagine that I can sand the surface to take care of the outside-the-lines problems. How about the bubbles? What paint should I have used instead?