Specialty Magnetic Primer - GWSRust Oleum Magnetic Primer is a paint that can transform ordinary surfaces into ones that attract magnets! This paint comes in dark grey and has a matte finish, and can be used alone or covered with latex paint or Rust Oleum Chalkboard Paint for a double duty surface. It is suitable for interior use on wood, metal, masonry, drywall, and plaster. To ensure optimal results, always adhere to the instructions provided. For best results Thoroughly stir the