You didn't hear it here and don't tell a soul, but I have it on very good
authority
that if you drain the system, then put in a can of Holts Radweld, run it
on the ground for about 20 to 30 minutes, flush completely and replace with
usual
coolant, it would be surprising to see the leak reappear.
However I'm sure that this could only be a temporary "get you home" fix if the
leak was just a "pinhole" in the radiator core and not a leaking hose or more
severe crack in the top/bottom collectors or large metal spigots.
It would also be a good idea to perform a test flight close to an airfield and
then inspect for leaks before setting off in good weather conditions with
suitable
diversion fields en route.
Really not to be recommended unless there is little alternative.
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