OK, here are my learnings from the PTC:
1. Open up the can of Behr Poly at the paint counter before buying. I grabbed the best looking can on the shelf, and the inner rim was rusted. If this wasn't a test screen, it would have gone back. I was still able to find a clean spot to pour, but you shouldn't have to do this.
2. As mentioned, don't shake and mix slowly to reduce air bubbles. If you are rolling, this stuff is watery compared to paint, so don't get too agressive with it.
3. OK, I'm ready to be flamed on this one. On my first attempt, I ended up with a work line. I followed the instructions to not overlap or overbrush. It wasn't a very noticeable line, but you could see it with the pj. So I sanded and put up another coat. This time, I very gently (and I mean GENTLY) went back over to smooth over the lines. When it dried, it was absolutely beautiful and looked sprayed on. Whether this has any useen effects, maybe the experts can chime in.
4. GO SLOW. Most of us are used to painting rooms. We try to do a good job, but we also try to get done in time for a Sunday afternoon of beer and football. You really need to concentrate on this to force yourself to break your painting habit and go slow.
5. If you use tape (like I did), remember to remove the tape right after painting. You'll avoid any edging problems by doing this.
Thanks for all the advice above.......