I always like to buy it direct from the source because I always know it is fresh. There are other vendors. http://www.caglue.com/ Lots of good info on their site too. May want to read into it.
I apply with blue towels from Walmart auto dept. When I micromesh I wipe and polish with Viva towels. I use to apply with those plastic bags that the pen kits come in but stopped that. I cut the fingers off a blue nitrile glove and put one on a finger when applying so not to get any on hand. I do not use on large projects so I can not speak to that but for pens I have never had any fogging or cracking.