MetalProtect™ Protective Sealer 16 oz., SKIT16-C. Enjoy the beauty of your copper or nickel sink or tub exactly as it was on the first day you bought it!MetalProtect is a revolutionary product, offering unparalleled protection to our polished copper and polished nickel sinks and bathtubs. MetalProtect creates a long lasting barrier against tarnishing and fingerprints and provides months or years of maintenance-free use.