In the past, it was possible to refill MSR canisters if you brought them into their repair shop in Seattle. However the repair shop has been closed under the excuse of COVID and still hasn't reopened despite Washington dropping all COVID restrictions on June 30th. I've asked REI employees if they know of an alternative refill location but they weren't able to help me, so it seems like the only remaining option is to keep buying new cans.
With this in mind, I wanted to start refilling my own canisters to avoid creating unnecessary garbage while hiking. But just how dangerous it it? Are the warnings on canisters about refilling just there for "cover your ass"/legal reasons or do I risk having the can explode on me all of a sudden if I refill it too often?
NB: I can afford to buy these cans without issues but feel bad about throwing out perfectly good metal after a few days of camping. So this question is purely environmental rather than financial.
Update: I’m not looking for instructions on how to refill canisters (I already know how that works). Just interested in odds of something going wrong if I do this over a long period of time.