Hi Hans,
The Kliar Nano-Ceramic transparent ecoating is excellent for
resisting tarnish. Sterling silver, copper, brass, bronze and other
metals retain their polish underneath the hard transparent coating,
however I would not say thatit is a permanent solution for
preventing tarnish. I have worked with the Kliar coatings for several
years now and I can say it is much superior to other protective
coatings such as lacquers and waxes. In your case of small sculpture
where your items are not worn, the wear of the coating would be
longer than that of a jewelry item, which could mean several years. I
would be happy to send you a few polished copper and brass samples
with transparent ecoating for you to see and handle.
Ashli Brooke Taylor; Rio Grande Technical Support