The cause of paint adhesion failures on copper is due to delamination of the oxide film from the metal.
Painting on copper sheet.
Learn how to use a simple flame to bring amazing color to copper.
Texturize the surface of the sheet metal.
There are several ways to clean copper before painting.
Acrylic metal paints are available for paint on application or in spray cans which can shorten painting time significantly.
Keep these layers smooth and thin by rubbing on a small amount of the lead primer with the gloved palm of your hand.
In 5 minutes i will show you how to make a sample piece plus a beautiful pair of earrings.
Create a rough surface on the sheet metal.
To do this apply two coats of very thin lead based oil primer to the surface.
These oxides must be removed before painting.
Some people use acrylic latex paint which is not designed specifically for galvanized metal so you will want to prime the surface before painting.
Paints that are made for galvanized surfaces will require less prep work and will adhere better than other kinds of paint.
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.
Analyze 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.
To properly prepare new metal surfaces use mineral spirits to remove grease and apply a rust inhibitive primer before painting.
The best way to clean copper before application of organic coatings is the one that works for you.
Do not use alkyd based paints or oil based primer.
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.
Priming is traditional when painting on copper plate.