How do you glue these back on?

We use it as a cleaner/solvent at work as well. I happened to spill a bit on the stainless top of my tool box. A bic pen rolled into it. I picked it up and it was stringy, then it dried and the stringy plastic hardened in strings. I glued 2 bic pen tubes together, then tried to break em apart. They broke apart anywhere but the glue joint, so i experimented with an A pillar moulding that was busted in half. Once it was dry i was able to twist and flex it like it was one piece again, because well it now was 1 piece again.