I think I have a very small leak in my radiator, probably at the
bottom, not at hose connections.  It is losing a small amount of
coolant, maybe 2 qts a month.  I think I can see what appears to be a
wet spot at the bottom of the radiator, but no actual drips.

Some questions:

What are opinions on trying one of the stop leak products?   If used
as directed is there any danger in trying and seeing if it works?
I've never used one before and just a bit worried about possibly
plugging up something else, like the heater core, etc.

Anyone have experience getting a radiator like this repaired?  It's
the original, 28 years old.  I'm thinking since it's that old and shot
in one spot, then it's probably corroded elsewhere, etc and not
repairable.   But on the other hand, I see radiator shops advertising
that they do repair radiators.

If I do need a new one, any suggestions on sources?

Finally, the electric aux radiator fan is kaput too.   Looks like I
can get Bosch for $180 or Meyle for $120.   Any thoughts?    Also, if
anyone has an old one that might have the plastic brush assembly
that's inside the motor intact, let me know.   That's all that's wrong
with the original one, the plastic brush holding assembly in the back
of the motor is broken.

Thanks