Exposing the heatsink on your MMM?

[webracer]

I have been thinking of removing my MMM case altogether, and submersing the ESC in a bath of silicone fluid. I haven't done it yet as I cannot find a clear plastic sealable box in a suitable size for the ESC. This will keep it cool (and I could add another heatsink to the outside of the box), and make it waterproof.
Has anyone done this? I want the clear box so that I can see the lights on the ESC.