My understanding of how sealing kits are intended to work: sealing kit is made at a certain QL and takes damage with re-use, eventually crumbling to dust - essentially a re-useable peg with a limited number of uses based on QL.
How sealing kits seem to be currently working:
sealing kit of any QL is applied to an amphora
when sealing kit is removed, the sealing kit inherits the QL of the amphora + a little damage, not the QL the sealing kit had at application
sealing kits re-applied to the same amphora continue to take damage
sealing kits applied to different amphora inherit the QL of the new amphora and begin taking damage again as if they were new
I use a lot of wax seals, so I wasn't sure I was misremembering how they work - but I finally found one that was from over a year ago and it was a higher QL than the amphora that it came from - and about the QL that I try to hit when I create them, so I think something must have changed in the last 12 months or so.
Now I'm not sad about infinitely reusable wax seals! But I thought it was worth a mention.