Dave and many others have had similar experience with the stop leak products.
A weep or occasional drip will dry up and the van can be run for more miles.
If a pool or puddle collects on the ground after driving, do yourself a favor and have the heads resealed.

dylan

________________________________
From: Dave Arthur <dave.arthur@NSCC.CA>
To: vanagon@GERRY.VANAGON.COM
Sent: Sunday, January 25, 2009 8:40:49 AM
Subject: Re: Head gasket leaking. Bummer.

FWIW on the topic of leaking / weeping head gaskets (of course we should
really be calling them coolant gaskets around the head), I had a problems
with my '86 2.1. After driving I could hear a drip and sizzle of coolant
dripping onto the heat shields.

Upon advice form the list, the choice was to use the Bar's Stop Leak or
Suburau part http://www.subaruparts.com/catalog/?section=366

I opted for two cans of the Subaru material and followed these instructions:

*
Siphon enough coolant out of your EXPANSION tank, not the overflow tank to
make room for the two bottles.
Shake 'em up, pour 'em in. Some on the Samba forums say to run your motor
for a few minutes, then shut it down for a while so it disperses through the
engine and not the rest of the system when the thermostat opens. My weep
literally stopped within a couple of minutes and hasn't come back. Some
folks on the Samba say it has sealed them up for years! I'm hoping it gets
me by til I have time for a head gasket job.
*

The material and procedure worked for me. I haven't had any radiator /
heater core issues. The leak stopped within minutes. One recommendation was
to let the engine cool off after the above procedure and not to run it for
24 hours after the material addition.

Hope this helps.

Dave