Pressurized containers do not lose pressure over time, gas bubbles [with the same gas in the bubbles] remain in ice for thousands of years, glass is sometimes used to hold gases. Im not saying wax isnt airtight, but its not the only thing that is. Plus, no doubt there exists some types of wax that would absorb gases.

As for the plastic: Due to watching curry irretrievably stain plastic containers, i dont doubt that some curry is absorbed a little way into it. Therefore its not unlikely that an amount of THC would be absorbed. But the amount is so infinitesimal that it hardley counts as "suck[ing] most of the thc heads off". And, of all the things that ive ever put in/seen in plastic bottles, the only ones to seep out the sides were the ones that actually disolved the bottle.

No conflict intended.