Lol, you're not talking about epoxy resin are you? That stuff will make a permanent bond. Thats what I used on my rear wheel speedo sensor for the veypor to attach the magnet to the rear hub.
If you want to be able to remove them, I'd go with the 3M tape. You just have to use a lot of it with good placement and clean the area first really well. I'm telling you, it'll stick really well, but at least you'll be able to peel the parts off later if they get damaged or you want to remove them later for any other reason.