Testing the coating on magnets
What methods are good for verifying (as best as can be done) the quality of magnet coatings? Whether I coat one myself or purchase a pre-coated one, I'd like to ensure that what I'm putting in my body is safe.
I happen to have access to a research-grade Parylene coating chamber, so I'll likely use this. I'll certainly inspect the magnet visually with a microscope but would like a more rigorous test. What immersive solutions have been found to reveal imperfections or gaps without compromising the coat?
Most responses to this kind of query are "don't do it yourself, wait for the M31". It seems like (a) rejection rates are comparable if not higher for metal-coated magnets than for parylene, and (b) if I perform similar testing to those who sell implant magnets, and mine pass all tests, I have no reason to believe mine are any less safe. I would also perform these tests on a pre-coated magnet no matter how many people tell me "the guys who made them know what they're doing".