Hi Guy's,

Looks like I have a pinhole leak on the bottom left of the radiator. not in the matrix, in the bottom box section (not sure what its called).

When I reach the correct temp it leaks a little, when cool nothing.

Wanted to make sure i'm good to use a Radweld product. I belive it will be ok, just checking with the experts.

 

You mean the bottom tank I presume.
In my opinion I'd take it to the radiator shop for a pressure test, flow test, and repair. If you have one pinhole the second one isn't far behind. I speak from experience.