Roger,
How big are the pits? If they are the small dimples which are less than 1/16" in diameter that is because it is stone and is imperfect. If it is larger you should fill them like in DVD 3 (which I know you have). If you want to make them less visible try Pectro by Tenax. The dimples will appear to hide because of the stain.
http://www.defusco.com/tenax-pectro-clear-stone-treatment-liter-p-2477.htmlhttp://www.defusco.com/tenax-pectro-black-stone-treatment-liter-p-2303.htmlOr you can call me at 800-289-6834.
Mark