[Tom Goldman]

Subaru Cooling System Conditioner , part number 35071,[ they don't call it sealer for legal reasons] works fantastic for small leaks .
We used it for Jeep 4.7 engines with cracked heads and it rarely did not stop the leak , and most stayed sealed up for more than a year.
2 small bottles did the trick and it only costs $3.00 a bottle.
I use it on one of my Big Block Chevy engines with copper head gaskets ,completely stopped all the weeping ,even with a 12# cap