I just found an e-mail from CoolMiniOrNot in my inbox, and it contained an ad for something I thought some of you guys might be interested in. It's called Instant Mold, and it's a flexible putty that can be softened in hot water. When you press an item into it (a small component or something with a texture) and let it set, it retains the shape of the item, so you can use it as a mould, and it's non-stick, so no mould release required. When you're done with the mould, you can just stick it back in the hot water and re-shape it into something else. While obviously I've not tried it myself (having only just heard of it), it does seem very similar in principle to something I do have, which is a thermoplastic called Polymorph. The difference is that Polymorph comes in pellet form, and sets much harder, like solid nylon.