Just get a new one, as you will never get it to stay sealed.
How would you like to be in hot persuit of the jerk banging you wife?? Driving like Jason Bourne?...and all of a sudden, because the "repair" failed,
you find yourself on the side of the road with a blown engine...
As he gets away with her to their secret love nest !!!!!
Just get a new one !
http://www2.partstrain.com/store/pro..._name=radiator