with vinyl I don't have to:
-use a hair dryer
-ever have to remove extra adhesive (with decent vinyl, at least)
-worry about bleeds unless I really push my luck near the edges.-admit that I use contact paper
LOL, well for cost/beginners or intermediate dyers out there contact paper will over all do the trick, I started with contact paper ($8/ 24''x25' via hobby lobby) and I've done some pretty intricate designs with success! But now that I've done a buncha dyes I find myself with a "bleeding phobia" whenever I use contact paper with very small or thin areas.
I recently purchased some of that Oracle 651 vinyl I read on here was supposed to be pretty good. I bought (1) roll of white and (1) roll of transparent, Have only dyed the transparent stuff and it's pretty much the same as contact paper but a lil more expensive (Do Not Buy!) , Even though I haven't dyed the white yet, I've wrapped 2 or 3 discs with it and it feels much better than the transparent. I was using 3M graphic film vinyl scraps from a local sign shop that worked really really well, but was a pain in the A$$ to get air bubble free when wrapping a disc.
So for the record, I use both but for special or paid dyes I go with VINYL