Here's a no fail way to get the mix right:
Get some of the clear 35mm film canisters from your local photo shop. Using a ruler, make 2 equally spaced marks - a fine point sharpie pen works best. Pour the resin and hardener to the marks and mix. I make sure to grab a handfull of chopsticks every time we go to the chinese restaurant. They're perfect for this.
The one time I didn't do it this way, the stuff didn't set up. I had to wash the plug down with alchohol and redo it.
If I know I'm going to be a while coating multiple plugs, I pour the well mixed epoxy into a plastic coffe can top. Spreading it out slows down the cure rate.
For a thin even coat, try the small foam brushes. As a bonus, they fit perfectly into the film canisters.
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