I also use the thimble pads. I usually order them from Connecting Threads. I EPP every day and use the same pad for around a month before I need to replace it. I just stick it on the outside of my plastic EPP container when I'm not using it. I have noticed that if I use hand lotions just before sewing, it doesn't stick as well. The oils in it tend to break down the adhesive.
http://www.connectingthreads.com/too...L60050120.html