To properly prepare new metal surfaces use mineral spirits to remove grease and apply a rust inhibitive primer before painting.
Painting on copper sheet.
Some people use acrylic latex paint which is not designed specifically for galvanized metal so you will want to prime the surface before painting.
For best practice to prepare an aluminum sheet for painting three steps are required that will provide the most assurance that both the paint will remain attached and the metal will be less prone to continue to form disturbing oxidative products on the painting.
Paints that are made for galvanized surfaces will require less prep work and will adhere better than other kinds of paint.
Priming is traditional when painting on copper plate.
The cause of paint adhesion failures on copper is due to delamination of the oxide film from the metal.
To do this apply two coats of very thin lead based oil primer to the surface.
Analyze the surface of the sheet metal.
Tim spillane explains the many artistic benefits of painting on sheet copper as a surface for his paintings.
These oxides must be removed before painting.
Acrylic metal paints are available for paint on application or in spray cans which can shorten painting time significantly.
As with all metal painting projects proper preparation makes the difference between a quality paint job and how well the newly painted item will stand up to age and weathering especially when the metal is used outdoors.
Texturize the surface of the sheet metal.
If painting light to moderately used indoor metal surfaces think wall sconces bed frames or guest room night tables go with water based acrylic paint a cheaper 15 to 40 per gallon.
Learn how to use a simple flame to bring amazing color to copper.
There are several ways to clean copper before painting.
Do not use alkyd based paints or oil based primer.
The best way to clean copper before application of organic coatings is the one that works for you.
If the sheet metal is smooth to the touch you will need to texturize it before painting.
In 5 minutes i will show you how to make a sample piece plus a beautiful pair of earrings.