I didn't bother sealing any of my Atoma plates and none have rusted. I don't do anything special after using them other than giving them a few vigorous shakes to get rid of any large water droplets then drying the outside surfaces with a towel. The DMT plates are very easy to de-rust - the rust is usually just steel removed from knives or razors rusting on the surface of the nickel plate. A good scrub with some Bar Keeper's Friend cleanser will clean that right up. I usually sprinkle the cleanser on and use a sponge soaked with hot water to make a paste of the cleanser and spread it around the plate, allowing it to soak for a few minutes then scrub it a bit and rinse. Result is a nearly new looking plate.