Magnetic paint

Or rather paint that magnets stick to if you do enough coats. The tin recommends three, but I would suggest five. It will be covered with normal paint so you would never know, except for all the fridge magnets attached to the walls.

Every time I go somewhere new, I like to get a fridge magnet as a cheap momento. But Glyn had a new kitchen where the fridge
door isn’t magnetic so I had to find elsewhere to put them on display.