leak problem

[Ogie]

hello everyone!
tanong lang ako kung may nakagamit na sa inyo ng leaking material/substance? may leak kasi yung radiator ko,and i saw this can saying na pwede yun and will fix any leaks from radiator to tank or whatever... tapos meron din isang klase na parang powder naman in a tube.
may bad effect ba if i'm going to use it as to performance? Can i still use radiator coolant after applying this substance?
can you help please! thanks!