This "mystery spray", as I stated this earlier in this thread, is Krylon #1305 UV-Resistant Clear Acrylic Coating - Gloss. It comes in an 11 oz. aerosol spray can. It's around $5 a can. I can spray around 50 discs with 1 can. I buy it at Michael's (art supplies chain). The non-UV version is #1303. Once you get the technique down, your R200/300 printed discs look as good as anything Hollywood puts out... Isn't that what we're all after? PM me with any questions.