What can be the possible reasons for non-adherence of concrete mix to cement board?

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Michael Clark

The Cement board may have an oily film on its surface

You might try cleaning and etching the surface with a dilute sulfuric acid, then

wash it off thoroughly. Try this on a small scrap of the material, and test

methods of cleaning the surfaces using detergents, or acid etching, or

sanding, or some combination.