Does anyone make a good paint pen, marker, etc. for use when mag drilling? I am laying out my holes and punching them, but the light punch marks can be hard to see, so I circle them. Unfortunately, the cutting fluid washes away any marks nearby, so the next hole is harder to find. I'm looking for a marker that is more resistant to cutting fluid, but I can clean up later with a more powerful solvent (xylene? n-butyl acetate?).