There are several ways to make a magnetic surface. Here are the best:
BloxShop Magnetic Additive for Paint
Easy . Safe . Economical . Fun
Mix with 2 cups of paint
Covers up to 10+ sq. feet with 2-3 coats
Total time: 2-3 hours
For More Information, click here.
Apply like regular paint.
Cleans with soap and water.
Use Foam Roller for smooth finish.
Stir in between coats.
Apply with textured roller for a textured look.
Not as many coats will be needed.
Learn more: http://www.bloxshop.com/magnetic-wallpaper.html