Many recommend to pin + superglue + epoxy(green stuff) metal models(plastic-metal or both metal) like how Spindoc described a few pages back. Its not hard to see why as it creates a very very strong bond.
However, since i have no pinning set (i aint got no drill) i am only able to use Krazyglue which i heard is a good superglue. I bought it at Artfriend bras basah for $3( very ex for a super glue

). So my metal daemon prince is glued with that (score the two surface, moisten abit with water and then put abit of glue and lastly stick & hold it in place as long as you can haha.) But im not very sure how long the bond will last, so far no problems.