Writing surface for notes
In order to be able to create notes that can be wiped off, I combined magnetic paint and blackboard paint.
I used masking tape to cover up the rest of the board and painted three coats of magnetic paint
(1x horizontal, 1x vertical, 1x diagonal).
You definitely need three coats, otherwise, it won't have enough iron content.
After it dried I painted a coat of blackboard paint
over the magnetic paint.
And there you have a board that you can write on with chalk markers (real chalk is so dusty).