Are there any special care or maintenance concerns for Kydex holsters?
Wipe clean once in awhile, monitor for cracks at stress points, thread locker on screws.
Not all makers or materials are created equal, buy good stuff.
My son learned how the AZ heat will mess one up if you leave it in your car. It doesn’t take much to turn kydex into mush.
Avoid extreme heat (as Mark said), Solvent (Acetone, etc.), use it like you own it.
Screws will come loose.