Rust-Oleum Magnetic Primer is a base coat that allows you to create a surface that attracts magnets almost anywhere. First coat of primer should be sufficient enough to completely hide underlying surface and subsequent coats should be of equal thickness. Use it to create a fun and unexpected way to hang notes, photos and more. Flat finish provides a surface that can be easily top coated with any latex or chalkboard paintIndoor use only on wood, metal, masonry, drywall and plaster and then top-coated with any latex paint or chalkboard paintOil based formula that creates a surface that magnets can easily attach toApply three coats of primer 30 minutes apart, top coat 4 hours after final coat of primer