Overheated due to Cooper stop leak

Please refrain from using profanity! Most likely the stop leak product worked it's way into the cooling system passages and has restricted the flow of coolant. Flush out the cooling system using a chemical cleaner to get rid of the stop leak product, refill the cooling system, and check for leaks. If you continue to overheat pay attention to when the overheating occurs. If you overheat when driving it's a coolant circulation problem such as a bad water pump, stuck thermostat, or (still) clogged cooling system passages in the engine. If you overheat when at idle or slow speed driving it's an airflow problem. The cooling fans are not working, the front of the radiator is clogged with dirt, leaves, or other debris. Hope that helps! Jim

Maybe it overheated due to low coolant level.