Chalkboard Journal Fail

This Christmas I decided to make something crafty for Blockette.  She loves journals and notebooks to write and draw in.  I thought that this Chalkboard journal from No.2 Pencil would be perfect.

Except that it wasn't.

I don't know what happened.

This time I followed the directions exactly.  Not even taking a single short cut.

I even used 6 coats of Martha Stewart chalkboard paint compared to the 4 in the tutorial.  Just in case.

I rubbed the surface with chalk and then wiped it off with a damp cloth.   Just like the directions say.

Then I wrote on the journal cover.  Seemed fine.  I erased it with a dry cloth.

So I wrapped it and it sat around for a week.

Blockette was so excited when she opened it along with a brand new box of colored crayola brand chalk.

So of course she grabbed a piece of chalk and went to town on the cover to see if it worked.

This is what happened:

If you look in the upper right hand corner you can see 2 games of tic tac toe she played with her father.

How sweet!

Only...

They will NOT come off.

I tried wiping it off with a dry cloth and paper towel.

Then I made it damp.

Neither thing got the chalk off.

I even tried rubbing more chalk on the cover with the side of the piece of chalk.  All that did was scratch the cover and change the hue to a slightly different shade of blue.

I don't know why it scratched the cover.  I wasn't using my super Hulk like strength super powers or anything.  Just a light gentle hand.  Maybe I AM the Hulk?

Any tips or suggestions about what I might have done wrong?  Or what I can do to fix this craft disaster?