Sounds good, Mark.  My (former) Vanagon mechanic in Norman, Oklahoma
(Darrel Cook, Darrel's Hobby Shop, great guy and excellent VW man) filled
the tiny cracks in the heads on my 1991 Volkswagen Vanagon GL Campmobile,
original waterboxer with at the time 135K miles, now 195K, with a metal
paste type material.  No leaks at the heads since.

On Tue, Apr 11, 2023 at 4:34 PM Mark Drillock <madvws@cox.net> wrote:

> My experience with the Subaru "conditioner" has been very positive.
> I bought a high mileage Westy with 2.1 about 9 years ago.
> It had the classic wbx head crack near a spark plug and leaked out
> coolant in small amounts with drops showing on the ground at times.
> Though planning to replace the engine, I decided to add 2 small bottles
> of the Subaru product to the main coolant tank.
> My hope was only to delay the real fix until a more convenient time.
> That engine has gone maybe 70k more miles since then.
>
> Mark
>