I've done some work on chemical plants with hydrogen. Through a long chain of people (I was nowhere near the actual bare metal operations) I got a very strong i

I've done some work on chemical plants with hydrogen. Through a long chain of people (I was nowhere near the actual bare metal operations) I got a very strong impression that sealing hydrogen is a pain in the ass, it makes its way through every joint and seal. I'm sure some of it is reactivity but it being tiny I think also causes it. I know some of the machines must never be turned off because the sheen created by the ongoing reaction helps to seal it