Ok, I am stumped, I just tried gluing together these figures, waited until the morning and they just pop apart easily. When I used to wargame, I used superglue and pinning but I stopped wargaming years ago and now just do model kits and other hobby stuff. normally this liquid cement I have can fuse anything, scale model kits, pvc figures etc. However, these figures, the plastic refuses to fuse and even with 5 hours curing time my liquid cement is not enough. So before I coat these guys in layers of plastic cement, what the heck should I be using, please don't say epoxy.

this is my brand of liquid cement

any help would be great