Gary
Do you use Kneadatite to connect the different parts ?
The soft plastic figures usually are a hassle to keep them attached.
Major assemblies (body halves, etc) I use 5-minute epoxy
Minor assemblies - weapon to hand, canteen to belt, I use ACC ("super glue")
I do use kneadatite as a filler, and it can serves as an adhesive, it's just not my primary choice.
So far my primary customer hasn't had too many complaints about things falling off
You ARE right, the soft plastic is a royal pain to ensure that you get a good bond. That's why body parts, arms, legs, etc get supported with pieces of brass wire - I use Details Associates (a model RR supplier) which is available in multiple sizes. On the figures above the barrels and gas chambers of the two StG44's are brass wire with Detail Associates flat wire bent for front sights. I also used brass flat wire for the SMG sling on the kneeling MP40 gunner.
I admire Gary Dutko and his technique which uses a hot knife to join the soft Conte figures, but I haven't taken time to learn it. I have a system that works pretty good for me, so I tend to stick with it.
Gary B.