thanx quadrille:
yes that is FIMO, i use it to sculpt mechs cos i can get really sharp edges, and smooth surfaces, i sometimes have problems with GS in that respect. i usually sculpt blocks in one stage, for example the torso was sculpted without baking, then the head, arms etc.
getting a smooth surface can sometimes be tricky, specially in large areas, i use a little water to help me there, even though fimo doest need it, ive noticed it helps with the process, not much though but a little bit is really handy, if im still not convinced i just bake it and smooth it the hard way

, file and very fine sand paper in hand, some times even a cutter.
with GS the smoothes has no secret just practice im afraid, im still having problems with it sometimes, just make sure my good ol friend sand paper is handy. but a very usefull tip is NOT to use lots of water, use the less water posible so that putty doesnt stick to the tool, my friend ergman told me that one and surely helps a lot