If you are going to use a coating like a lacquer use ones that are
designed fro the purpose not the consumer grade clear coatings from
home desperate or other hardware stores. A great lacquer for metal
is Nikolas 2105
It is a modified nitrocellulose lacquer designed for metals I have
used this lacquer for years and it is excellent in adhering to metal
and patinas. As with the lacquer mentioned above you cannot by it at
the home store but you can purchase it from Nikolas.
But even the best of coatings will not stand up to daily wear on
items like bracelets, rings etc. it just is too much to ask. So
either accept that or design your work in such a way to protect the
work and or patina from abrasion from clothing and the day to day
environment. Even the exotic CVD black coatings wear off, it is just
a fact of life.
James Binnion Metal Arts