DO NOT try using glitter on the DVD's. Even with a clear coating they all don't stick and still make a mess! The DVD's do look impressive though, just not worth the two extra days to cover 1/3rd of then with glitter.
Are you also giving them a free DVD or Blu-ray player with each disc? Sounds worse than trying to put a sticker label on the DVD's that would throw the disc out of balance of years ago. Also, what about the glitter that comes off?
I put the glitter on the printed DVD. I then sprayed with a clear sealer. I left that & then sprayed a second coat ~15 minutes later. After I let that dry I checked to see if it would come off (glitter). Some came off. So I sprayed another two coats. This morning I took a slightly damn sponge and wiped the front of the discs. some STILL came off but everything else on there seemed to stay.
It seems like it's going to stay but it took me two days to do what normally takes two hours (just spraying the discs). I'm HOPING it stays on the discs, if it gets on the laser or on the bottom of a disc it will be heck to figure out what's wrong. :(
I'll preface my comment by saying I have no idea what I'm talking about but it seems to me that this is a realllllly bad idea. In theory I would think that DVD's spin pretty frikkin fast and that they should be balanced or there might be a chance of it going lopsided, shattering and wreaking havoc on the DVD player. Perhaps the inertia of the spinning would prevent this but personally wouldn't want to put something like that in my DVD player or drive.
This is one of the most extraordinarily bad ideas anyone could possibly propose, but perhaps my perspective is tainted by having grown up going to art fairs in the 1950s where we kids were encouraged to create "spin art:"
You are pretty much ensuring that the inside of your client's DVD drive is going to look like the inside of these spin art machines after a few dozen kids have dropped paint on the spinning paper.
If you want to make sure you never have to do another job for a client, then give that client a DVD with glitter glued onto the surface of the DVD.
I'm not seeing how ~20 pieces of glitter could offset the balance on a disc any more then ink on one part of a disc or a slight thickness difference with the clear coat. Best guess on the weight I can come up with is a single piece of glitter weights ~0.00000005 pounds.
Assuming that TheHappyFriar is serious, I think the idea is crazy because it could unbalance the DVD and the glitter is bound to come off in the player, causing all sorts of grief, as has been mentioned already.
A better idea would be to gift wrap the DVD in glitter paper. Then put it in a card which plays a melody when you open it.
If you think the recipient would prefer something more masculine, you could throw in a pair of Groucho Marx's spectacles (with eyebrows, nose and moustache). Or a cap with spinning propeller. Or ...
I think we have all abused the word client in this post. This probably wasn't given to a client as it has glitter on it and it doesn't sound like they paid for the time to "bedazzle" it. So hopefully this is a once and done occasion and we've all learned that Hello Kitty should only go on a "Hello Kitty" DVD or Blu-ray.