I cast open cones all the time. I like open pine cones. I trim them down with the saw to squeeze them in a mold then cast. Like ken, I paint my tubes of course a similar color to what I used to cast the cones. Always paint them tubes! I've cast some clear ones too, those are cool, then paint the tubes for a deep effect. baby pine cones can just be tossed into a bigger mold and poured so they land in various positions and end up looking a bit like roses when turned. As long as the cones are dry, you are good to go. You wouldn't drill most pine cones before you cast them or the cone would fall apart. Those big closed cones, you can flood them with CA and then drill them, but not an open cone. Cones require a finish after they are turned. Alumilite is a better product for casting cones because of all the really tight little spaces..the product gets in there better. But..if you just have PR...it'll work. Worse thing that can happen is you have a couple voids to repair as you spin the pen.