Overheating after using bars leak

Well, the first thing is, you now recognize that attempting to seal some kind of leak using a product like this often causes more problems than it solves. It is likely that you have caused a restriction in a cooling passage or a cooling system component that is causing overheating. That said, the original concern that caused a leak could still be the cause of a problem. Hands on testing is needed - a cooling system needs good flow of coolant (has that been checked?) the ability for the radiator to be cooled by air flow driving and a cooling fan (has that been checked?), a water pump that circulates coolant and a thermostat that opens at the right time. The cylinder head cooling passages also need to be intact. Perhaps seek another opinion from a shop near you. https://repairpal.com/auto-repair-near-me