Hello,

I used AlumaSeal for 60,000 miles before I overheated the engine when a
belt broke at 75 mph.  After that, the AlumaSeal would leak about 5 drops a
day if the car wasn't driven every day.  If driven daily, it didn't leak.
 So, I did the JBWeld trick on the leaky head.

I chose AlumaSeal because I figured that the aluminum would be sacrificial
if the coolant was too acid and thus reduce corrosion.  Summer temperatures
exceed 110F here and the Vanagon doesn't overheat, so I think that I have
not harmed my radiator.  The only side effect is that the AlumaSeal can
crud up the expansion tank pressure cap.  This takes about 2 years.  The
first symptom of the pressure cap failure is coolant loss after shutting
off the hot engine.  I have learned how to disassemble the pressure cap and
clean it.

Mike - Phoenix AZ  '84GL  '58 Isetta  '79 Jet ElectraVan