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The above two methods do not get the job done for you, then you may have to use commercial lacquer thinner. To prevent sags and runs use short dusting strokes allowing Incralac to become tacky between light mist coats. For exterior copper that gets a lot of handling, ProtectaClear is recommended because it is tougher and more scratch resistant.
From looking at the photo it almost looks like it’s been in a barrel polisher for 10 hours and then left wet. I pulled the aluminum strips out and shot 'em with a DuPont automotive clear while the strawboard received a protective coat of McDonald photographic lacquer to protect the latex faux painting treatment. The marks on this candlestick base are beyond normal tarnish and will not be removed by normal light polishing nor mild solvents. This is the first times I’ve had this message, in about 3 years of working this way selling hundreds of items.It is an activity to be recommended when the results of a good meal might lead to an unhealthy easy-chair slump. Some lacquers, especially the basic cellulose type, allow tarnishing to take place under the surface of the coating. Clean, polish or patina your copper to the desired finish and then coat with Everbrite™ or ProtectaClear® or CrobialCoat™ to stop tarnish and to lock in the shine and patina on your copper fittings and hardware – indoors and outdoors.
Hold Tableau Anti-Tarnish Lacquer can upside down and spray for one second to clear nozzle after use. Just yesterday I did a couple samples that were faux painted strawboard (same as MDF except uses wheat straw instead of wood fiber) that had decorative brushed aluminum strips down one side.Looking at my PPG product data sheet book I see that they spec out brass and copper in the same section as aluminum that is to be clear coated. This coating can be used to coat over surfaces that have been precoated with ProtectaClear® or can be used alone. Use Everbrite™ for Copper Roofs, Building Cladding, Spouting and Downpipes, Weather Vanes, Capping, Fittings and Outdoor Sculptures. Now you can add another level of design to these individual products with our new tinted lacquers, Brass and Copper.