I've started a kitbash project which will eventually give me a lovely set of seekers. The only thing I was missing was the cone style heads from Thrust, Dirge and Ramjet. After a bit of research I came to the conclusion that it was worth trying to sculpt the head from scratch and make a mold of it. After a few tests I've settled on Games Workshops "Green stuff" which I found just a little more easier to manipulate than milliput, and it polishes up really nice. I've kept over work to a minimum, molding a small amount of greenstuff at a time, letting it set, sanding and polishing it to shape, then adding a little more. The basic shape has really come along and I’m very happy with it at this stage, but its almost time for adding fine detail. (Panels, vents) I've been using sand paper and a dremel with a buffer tool to bring the sculpt up to a fine finish before each new layer but I’m worried the sand paper and dremel tool will be too harsh for the fine details and just wear it all away. Are there any hints and tips to removing imperfections and scrape marks without dulling the detail? I'd really appreciate any suggestions.