Walnut Shell Grit is easily added to paint, mixed-in and applied to surfaces to create a non-skid / anti-slip coating. Select the Walnut Shell grade for coarse, medium or fine texture. Walnut Shell abrasives stay in suspension in most paints, for easy mix-in applications. Composition Materials has supplied Walnut Shell Abrasives for over 60 years. We supply a full line of Non-Skid Media.