I use DCL exclusively for bottle neck lubing, it's great stuff. And although I have known of numerous reloaders that use the baggie method, I also have heard of nearly as many sticking a case, and then blaming it on that type of lube.
Lube dents would be a concern as well, due to lube getting on the shoulders. I've tried the baggie method and not only did I have a couple close calls regarding sticking a case, but I also experienced a few lube dents.
If I'm trying to manage time due to a demanding schedule, I'll lay them out in a shoe box, spray, roll them about 180 degree's, spray again. I then put them in the loading tray while they're still wet, and then wipe the shoulders off with a Q tip to prevent lube dents. But when time is on my side, I fill the cover that comes on the DCL spray nozzle with lube, and then use a Q tip to lube. I also put a dab on the inside of the necks, make things go a little smoother.
Using either method, I found that 15 or 20 minutes drying time is important when using spray on lube. This stuff won't work if it isn't completely dry, and you'll know it's dry, when you can't smell the alcohol any more.
GS