Taina, look here at Golden pumice gel:

It's certainly compatible with acrylic paints.

You might try googling 'pumice for pastels' for other products.  There is a
gel that is used for watercolor repairs that could be mixed with a grit of
some sort. Believe you could find pulverized granite somewhere.  Golden
also makes a color called 'micaceous iron oxide' that dries with a fine
gritty texture.

I'd check Jerry's to see if they still sell the sandpaper type pastel
paper, which used to come in various stages of grit......including one that
required large quantities of pastel sticks.


On Mon, Apr 25, 2016 at 6:36 AM, Dorie Petrochko <[log in to unmask]>

> I know you can buy a paint at home depot that mimics a  chalkboard surface.
> I don't know what they put  in it. But gouache serves well as a surface to
> accept
> chalk because it is matte and if you paint it on a sandpaper-like surface
> it should work fine

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