well i used water based clay for my krueger head sculpt because it's lifesize
but i think for smaller parts oil based works better
oh yeah i hate to wurry about drying out
but i know a good thing
i put some wet cheets around the sculpt and a plastic bag over it
works good for me and it won't dry out or get hard
I've used Roma Plastiline #2 for my sculpts. It works like a freagn charm. Hard enough to hold its shapre very nicely yet soft enough to work at it without breaking your fingers. You can get some of this pretty cheap at Dick Blick art supplies.
i use the Monster Makers oil based clay. Apparently its their own recipie or somthing, whatever it is i like it, when its cold its hard as a brick, but still sculptable, and when hot you can actually pour it into a mold,but i havent tried that yet.-joe
I haven't been sculpting for very long, I too have used the MM oil based, because I like the "chiselability" of it when it hardens at room temp. Occasionally I use a long nozzle gas grill lighter to heat and soften targeted areas.