I'm not sure as to the cure time or long-term expansion. I just potted my first driver a couple days ago and when I touched the soldering iron to the pill, I got the snakes oozing out. It _might_ not even be the fujik, as heat would cause any residual air bubbles to expand... but I filled the pill in one continuous pour without bubbles that I could see.
Applying it is pretty easy if you have a syringe. Getting the fujik INTO the syringes was a bit messy, however. I used these I'd horded for a few years, and it makes it easy-peasy to apply. For attaching emitters to pills, just pretend it's a cpu and you'll be fine. Put down a small drop in the center, smooth it towards the sides with the applicator tip, then just put down the emitter. Twist back and forth gently to seat it tightly, and that's all.