I’ve never had to reapply powder to any of my TBL bodies a couple times a year (aside from after cleaning with water), and I’ve had many of mine for over 10 years. The real issue with these things is light and humidity (and yes, keeping stress on the joints will cause issues) — but again, much of that also depends on the other two factors I already mentioned. If you can’t keep these figures (any of them really, not just the seamless) in a dark, relatively cool, room with even humidity, you’re screwed. It’s why so many have trouble with pleather cracking. Not one of my figures has had cracking pleather, cracking TBL bodies, etc., because I have my stuff in a room with blacked out windows that stays roughly the same temperature/humidity all year round, and I’ve been a collector for several decades.