frag glue

Alright, I am either an idiot or every single glue I've tried sucks. I've tried the Polyp Lab, the reef friendly super glue, and some other brand I forgot. As soon as I try to glue a frag to my rock, the glue just doesn't glue. Can anyone suggest a literal idiot proof glue lol.... Thanks!

You have your coral growing nicely on a frag plug on a frag rack.... now you want to permanently glue the frag disk/plug to your LR. But this requires UNDERWATER gluing bc the LR is aquascaped....so its impossible to remove the LR. You keep failing bc: * frag disk wont adhere to the LR bc the...