Jack:
Instead pf plasticine, which gets all melty when it gets warm, try that Plasti-Tak / Blu-Tak /Fun-Tak stuff...
Blu-Tack on Wiki
We all remember it as the white or pale blue stuff the teachers used to stick sommat to the wall when they couldn't use tape or thumb-tacks. We used to pinch it as it was ~wonderful~ for pea-shooting ammo!
You can get no-name stuff in the Dollar Stores, and you can also use it for masking stuff before painting.
New-Guy, JB-Weld is a HARD Lock. Its a type of two-part epoxy. Shoe-Goo might cut loose... but I'd say the tires will slip before the Goo cuts loose, as this stuff is used for shoe-repair.
WhiteWolf