Toyota Repair: overheating, radiator leak, necessary tests

Question
all of a sudden my engine started overheating and i check the coolant put some in n when i pulled that overflow hose it was percualting and smoking coming from the radiator so i let it cool down and put the radiator leak stuff n filled it did everything it said to do and it still is smoking? is it my radiator

Answer
Overheating can be caused by many things, from a stuck thermostat to a blown headgasket, there are just too may possibilities for me to guess which one it may be, I would recommend having a repair shop diagnose this so they can do the necessary tests to find out what is actually causing the overheating.