I haven´t tried thier greenstuff but a lot of people have said that it´s almost the same as PVA wood glue with some sort of powder in it. I´ve tried using PVA with a bit of plaster of paris added and amazingly, you can use it to sculpt small parts, hands etc. As it hardens you can shape things like fingers and patterns into it.

Hi Jens,
do you know Apoxie-Sculpt: http://www.fredericus-rex.de/Modellierma...culpt--Millput/

We supply with Apoxie - sculpt many modellers (Alan Ball > MB-Minatures, Markus Eckmann > Scorpio Models etc.)