Thanks, Dave
This is for the hum-cancelling P-90 design that'll be epoxied into the no-holes cover. Since I don't know how many will wind up being made, I'm keeping my eye out for something like half-gallon containers... small batches of epoxy could add up fa$t.
Might be looking for something along the lines of a softer epoxy, too, something that's not so rock-freaking-hard, so it'll dampen/absorb the some amount of vibration, which should help reduce feedback issues.
I'm almost wondering if a hard Silicone might be suitable, too...