We all have our headaches making plugs that's part of the learning curve. sometimes the internet gives too much info.
have I had failures hell yes not so much action wise but some paint failure mainly due to certain primers not behaving well with airbrush paints. others had sealing issues early on, you live you learn.

I continue to try different things if they fail they fail. I never got into this to sell them it was something to occupy my mind after back surgery #3.Everyone has their own methods. For now I'm getting by until something else rears it's ugly head.