I have used that plastic dipping stuff. It works but needs to be recoated more often than I have time for. Paint works best if you just want to be able to find your stuff among the flora and fauna.
I have resolved myself to the fact that I have to buy small pruners every other year. They simply don't stay sharp. Sharpeners don't really work. It's almost easier to think of them as disposable cutting instrument, much like household scissors rather than a tool. Trouble is I don't throw the old ones out! They are good for something?? I have about 6 pr of dull pruners here and there. I cuss everyone of them out every time I pick it up and use them! Totally my fault. Maybe among my habits, I need to incorporate a Garden Tool Day(s) where I repair, repaint, oil and sharpen my all stuff? meh
