Blackboard coating?

Hello,
Blackboard coating is for example just some filled epoxy paint, right?
Any suggestions for recipe? SiC powder? Aluminium oxide and some carbon
black? UV-resistant clear epoxy is already purchased :)
It seems to be that all the kids of the neighborhood seem to be "artistic" :), and I am quite fed up with cleaning watercolor stains off my porch. I have this terrible plan to move this spontaneous school of art with it's various visions off my yard and closer to the playground. A couple of square meters of blackboard with colorful chalks would be something new for them, too.
Any suggestions how to make chalks?
Yours,
Samu
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Samu Aalto wrote: .

why make? they come in all colors and are dirt cheap...
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