Without sidetracking too much: apoxie sculpt is a great, claylike, user-friendly medium. It's even a wee bit water-soluble, which helps with lubing, smoothing and cleanup. Like I say, soft, smooth and easily forms edges when 'wet'; and pretty hard and easily sanded or carved when cured. It's one problem in my opinion, is that it can be a bit too soft and fragile - crumbly, even - in the relatively tiny amounts and details applied to wargaming minis, and a bit too much water doesn't help that. What does help is greenstuff: while apoxie sculpt 'loosens up' greenstuff, GS helps bind the apoxie sculpt. That, or letting it sit a while to firm up. It's got a pretty good working window which allows that.