Nice to meet you at AMPS this year.
I did not attend that demo, but I seem to recall someone (Steve?) using AVES Apoxie Sculpt, which is a 2-part putty. I think there are several others at there as well, including Milliput.
Here's a link to the Ausfwerke site which demonstrates a technique (don't know if it's similar to Steve's?)
Ausfwerkes, Sprue Brothers and others stock AVES.
Some of my group are using Gator Glue (a water-based product), which I have ordered, but haven't tried yet.