I'm glad no one was offended.
Here's a link to some decoupage tutes.http://www.hometalkentertainment.com/forums/showthread.php?t=17055
If you dampen paper first, it works better and won't bubble or wrinkle bad. Just the opposite with wallpaper. Better on that with somewhat thicker glue (just don't water it down as much) and dry paper. I use plain old school glue, not the decoupage meduim. I'm cheap and have had better luck with regular glue. Water it down for any paper that's not wallpaper. With practice, you learn how to cut "darts" around corners and surfaces that aren't flat. Just takes practice. Grab an old glass bottle or a round plastic ball to practice with scrap paper. I still screw up the first rounded edge on every project I do!
I hope this helps. Check out my message board (in my sig) and register as a member. We have some cool stuff there.
Again, if anyone is offended by the pic, please let me know and I'll remove it. Thanks bunches!
And, sorry I forgot to answer your question. Yep, I deco'd it from underneath and after it dried, I sprayed with about 10 coats (thin) of clear "spray paint", Wal Mart cheapie kind. I give it maybe 2 additional coats a year. I run it thru the dishwasher all the time and it has held up fine.