Yank your radiator and put a new or rebuilt one in, and flush all that crap outta your system...Those seal in a can things are only meant for a temporary fix,,, if you have super hot manifolds you may have done some real damage,, no way to tell about that till you get your coolant system fixed... then start it up and see what happens.. Good luck !!
04' Rubi, with all the gizmos we need for long range excursions, / home modified excursion trailer;
96' Lexus 450, locked, loaded and ready to roll..
'12 VW New Beetle