Keep Copper Coating from blackening

I have a boat house with a copper roof cupola on it. The copper turns black in months. I have a yard bird house with a copper roof. The copper on that bird house is still copper after 3 years. If I clean my cupola copper roof and put something like a water based lacquer on it would that prevent the mildewing or what ever it is that turns it black?

Incralac
(brass lacquer with benzotriazole)

on eBay or Amazon

(affil link)

Hi...I haven't tried this yet myself, but I just had a custom fence made for myself with copper caps along the fence. I too, wanted to keep it shiny. I have been told to clean it with Brasso ⇦ on eBay or Amazon [affil links] , then wipe it with a lacquer thinner ⇦ on eBay or Amazon [affil links] Warning! flammable! to remove all dirt etc, then apply a product called Incralac ⇦ on eBay or Amazon [affil links] -- it is manufactured in CT and distributed in Ohio. They assured me this would work for quite some time -- Years. They also suggested after a few months to apply a car wax...This could be difficult for you! I am waiting for my shipment to come and look forward to trying it. Good Luck

adv.

"Clearcoats/Lacquers for Brass from G.J. Nikolas"