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How about that nanoparticle coating they use to waterproof your phone?
In case you haven't heard of this, they put your phone in a vacuum chamber, suck the air out, and spray this stuff in. It goes right into the internals and coats them, and afterwards you can use your phone underwater. Apparently it doesn't wear off either (i.e. charging port), because it works on a molecular level.
Maybe with a bigger vacuum chamber, you could do a sled. Probably not possible today, but maybe in the future.