It has officially drove me insane. I don't get it. Sometimes it will bond amazingly, sometimes it won't at all. Sometimes, I'll even be gluing two pairs of the exact same things together. One will stick, the other won't.
I'll clean the two surfaces, boil them, grind/sand them yet nothing works. Is there some trick I can use to make it bond? Is there a more reliable glue out there?
I'm at a loss...

