slow heater core leak

[mechanicalman]

i've got a super slow coolant leak (took 2 months to loose a noticeable amount) and i've noticed a slight glycol smell when i open the heater core valves. the smell isn't always there and it seems to go away after a few minutes of running the heater. i expect the leak is swelling back shut as the metal expands.

i'm not ready to pull out the dash to change the heater core since i've looked at the diy article and the problem just doesn't bother me enough to warrant such an effort.

question: are there any radiator stop leak products that you guys would recommend to stop such a leak? some seem like they'll just clog up the heater core without fixing anything.

/shiftless