Well, you have tweeked my interest, and I might rejoin the discussion later after doing some research.

I market a line of specialty DVD's, on recordable media, there just isn't enough volume to have them pressed, I used to mark them with a Sharpie, now I use a rubber stamp and ink formulated for non-pourous surfaces.

I have avoided Lightscribed labels as they increase my cost and are reputed to shorten the life of the laser.

It's difficult for me to believe there's nothing but a coat of lacquer separating any markings from the actual data - somehow that just doesn't ring true, but I'll investigate further because I don't want failures after the sale, obviously.

So far, after hundreds of sales, I've had only ONE return, and that was a clearly defective disc + inadequate QC on my part.