I first started using sticky pads on my tying bench to mix epoxy. After mixing and applying the epoxy to the fly, simply peel off and discard the top sheet to get rid of the gooey remnants. No special mixing containers needed.
I then started using it with head cement when I wanted to accurately apply it with a bodkin. This, of course, led me to applying UV cure resin in the same manner.
I also found sticky pads real handy for keeping track of small materials on my tying bench, for later use. The sheets of paper hold the materials well and the fact that they’re slightly elevated above your tying bench makes them easy to retrieve when needed.
This little bit of elevation also makes it easier to get hold of materials for composite loops.
Sticky pads tends to slide on your tying bench but if you peel off the back cover you’re left with an adhesive strip that grips, so the pad stays pretty stationary. This same adhesive strip also does an amazing job of cleaning up tying scraps. Once they’re collected, just tear off the sheet and throw the whole mess away.