I found this out from Coolminiornot.  They’ve just started selling stuff they’re calling Instant Mold.

Apparently, this stuff is sculpable like green stuff, but it become maleable when warmed, and hardens when cooled.

The potential for this stuff was immediately obvious.  You can’t sculpt with it, but you can make press molds with it, and create some pretty impressive stuff.

I’m looking forward to trying it out, probably using some of Scibor’s techniques in creating a press mold.