What I do is:
1. Mix equal parts in a small plastic cup. You need a lot less than you think, especially if you only cover the tops of the enclosures, and not the sides and bottom. If you are constantly wiping off excess that is running down the sides of the enclosures, then you applied too much....
2. I do the juansolo method of wiping excess off with a clean cloth and some electronic cleaner.
3. Since all my holes are predrilled, and are taped off using painters tape from the inside of the pedal, I wait until the envirotex becomes a little "gummy", usually after about 3-5 hours before I slowly begin to peel it off from the inside. Slowly. When doing this, I am looking directly at the holes, and watching to make sure I am not pulling too hard or too much. I am striving to peel back enough envirotex so that it creates a funnel with a hole (imagine black hole). You don't want to pull inwards too much and create a major pillowing effect. That could look weird, especially if you don't plan on covering it up with large diameter knobs, ha. Basically, you want to create a small hole that will help you drill once its hardened. I am at the point where I am able to tell when its "ready" and can pull the tape off leaving almost no residue whatsoever in the holes, with the slightest of pull/pillowing. Drilling afterwards is simple and no more pulling up on the envirotex that creates that terrible bubble-under-the-coat effect.
*NOTE: IME, envirotex seems to slightly "yellow" my spray painted finishes, but NOT a powdercoated finish. The lighter the color of the painted finish, the more visible the yellowing.
I just finished these this past week. The gold Klon is mine as well as the BYOC supafuzz (orangish box with the face). The other klons will be for sale. I have 3 supros to finish this week. 2 are blue and this one I might keep. I already have one blue pedal on my board.
All of these have just the top coated with envirotex. This way works best with powdercoated and clear/no finish enclosures.
Here is one more of my supafuzz (leedz fuzz) pre-envirotex. The other picture didn't do it justice. The decal is a foil type temporary tattoo. So, the tooth is a shiny gold and the rest is a silver when looking at it in real life. I love it.