I've used Procraft Lacquer as well as Midas Finish Seal lacquer. The
first one is slightly yellow but the Midas lacquer is clear and
water-soluble. In both instances when spots are worn off it is
almost worse than nothing at all because it cannot be spot repaired.
Drip lines, bubbles and lacquer pooling inside clasps, are other
problems with these dipping lacquers. Also, the Midas product
scratches easily. I've mostly spent time removing these lacquers.
Tarni-shield, a silver polish, might be good but it is thick and
gooey and difficult to buff off in small areas.
Last year, someone on Orchid suggested auto wax (thank you), but I
couldn't find the reference in the archives. I am using Turtle Wax
Finish 2001 car polish. It is a silicone resin, urethane product,
and not a wax. I brush it on and use a soft cloth to buff off the
haze. I have been wearing a pair of coated sterling silver earrings
24/7 since last October (washed with mild soap now and then), and
the coating is holding up with no signs of wearing off or changing
color. (I do not coat the earwires.) For cars, the product
manufacturer claims it withstands more than 12 months of car washes,
resists salt spray, tree sap, bird droppings and road tar, and is an
ultraviolet ray blocker. My jewelry is not subjected to these
assaults, but the coating does seem to protect against tarnish. Try
it! Nancy www.psi-design.com