Never heard of the stuff before today.
I had a quick read up and they claim that the crackling noise you sometimes get when you fit a head is because of the mylar dragging on the bearing edge. I find that a bit hard to believe, the only time I hear that sound is when I'm fitting a Remo head - its the glue in the collar making the crackling sound and perfectly safe (unless you really overtighten, but that will damage any head regardless of the manufacturer).
I'm sure the stuff will do what it says, but I've found regular candle wax works well.
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