I think labeling kits should come with a warning label (pun intended)
about the potential of damage to burned discs.
A colleague at work has a bunch of DVD video discs that started to skip
after a number of months, even though they were initially fine.
I asked it he had used labels on them, and sure enough his answer was "yes".
Plextor PX-716A TLA0304
Plextor PX-716A same TLA
LiteOn 52246S 52X CD-RW
LiteOn 52246S (another)
LiteOn 52327S 52X CD-RW
TDK 40X USB 2.0 CD-RW
TEAC CD-W540E 40X CD-RW