Haven't used, but love the color!
Not sealed, patina comes off easily.
I didn't realize it wasn't sealed with a coat of lacquer or some other sealant. As I worked with it, the patina it easily came off.
Lilly pilly copper sheets with patina
Although I really like these 'patina' coated copper pieces and like to use them in my work, they are not always as pictured. If I order 4 or more pieces, several pieces may have as little as 1/4 of the sheet covered with the patina and the rest of the piece will just be muddy and not useable.
The photo of the product shows a sheet of copper heavily covered with azul patina. The piece I received has 2 small splotches of patina. 75% or more of the copper does not have any patina. I'm very disappointed in the product and will return it.