Panzerfaust77:

I have to second hdbeast's recommendation for MEK. It can be used as a CA debonder, epoxy debonder (worked on my JB Weld just dandy) and regular polystyrene (plastic) solvent glue, and is ~much~ cheaper in quantity that CA debonder. I got 500 ml (17.63 oz.) for $12 Cdn at Canus Plastics (Ottawa)

To minimize damage to the tank hull, apply the MEK on the inside of the hull joint, not the outside where it'll eat the paint as well. I recommend a wooden-handle'd real-hair brush for application, or better yet, one of the Touch-n-Flow tools (basically a very thin hypodermic tube on the end of a glass pipette) I tied a regular eye-dropper but the tip is not nearly fine enough.

I just busted the back 1/3 off one of my two T-n-F's and will be trimming it back, not tossing it, despite the cheap price of about 6-8 bucks a pop.