You have a lot of choices in the glue. The glue we use for high peel strength and is pretty easy to obtain is:
3m Scotch-Weld Epoxy Adhesive in either DP-100 (3-5 min. worklife and fast cure) or DP-420 (20 min. worklife and 24 hour full cure)
The key is good prep prior to bonding. Scuff the parts with 200 grit sand paper if possible. Then wipe clean with Isopropyl Alcohol and allow to air dry. Make SURE all mold release, grease, grime, dirt has been removed!
Hope that helps.