I found dry erase crayons at WM and they are fun! It comes in a package of 8 with a microfiber clot - tey don't dry out!
... they are cool!~ I use a board in my kitcen to write everyting - from appointments to grocery list - can't imagine life without it - I'm thinking of getting some for my grndsons room so he can get creative with it - and he loves words(he's borderline autistic) sorry -- this info can't help you but had to share...

Here's my own answer.

The chalkboard pens are for use on the premade chalk pieces- I think they must be like ah adhesive type thing you attach to wood.

they will NOT work on painted or spray painted chalkboard surfaces.