what about melting hot wax around those airlocks? Has anyone ever done that to ensure a really good seal or is that beyond necessary?Most likely Smok1 is correct - But you can also take some sanitizer and wet down your cap/cork and the airlock stem. The level of activity may be so low that the gases are leaking out through the normal gaps in those areas. (That's why folks often don't see any bubbling in their airlocks when they snap down a plastic lid on their primary fermentation buckets. LOTs of gaps in those seals.)
Better to use a soft sealing wax. One you can apply with your fingers without heat. Such as (only an example, not endorsing as a product since I have never used it):what about melting hot wax around those airlocks?
Very much agree - My suggestion was just a quick way, without doing an SG test, to check for fermentation continuing.Beyond overkill, IMHO.