Hey, this is the coolest thing! It's magnetic primer paint!
The advert reads:
Rust-Oleum Specialty Magnetic latex primer is a dark gray colored base coat that allows you to create a surface that attracts magnets almost anywhere. Can be applied to wood, metal, masonry, drywall, and plaster. Create a fun and unexpected way to hang notes, photos and more.
Indoor use only
Top coat with any latex paint or even Chalkboard paint.
I love it! I have to get some! I can see it now...my tools and pliers hanging off the wall in front of my bench, easy to see and reach...awesome! You can go the Rust-oleum site and look for yourself.