It can make lots of difference which you are going to bond PTFE material to a composite or metallic surface. However, generally speaking, the first important step is to go through well-known adhesive manufacturer websites and look through catalogues presented for various class of adhesives. I suggest you to check 3M, Huntsman, Henkel, Sika, and etc. During the selection procedure, you have to clarify the mission of your adhesive or your bonded component as well as its environmental conditions. These will help you to get close to your final selection. After selecting your suitable adhesive (it is preferable to be able to join dissimilar materials such as ceramics, composites or plastics to metals), you should be careful about the surface treatment. A proper surface treatment, clamping condition on each surface, and curing condition would seriously help you to achieve a good bonding. Finally, as my personal guide, Araldite 2014 or Araldite 2015 could be suitable for your work.