The revenue bonds issued under the provisions of this article shall be payable, both principal and interest, solely out of the revenues to accrue from the operation of the facilities provided through the special project for which such bonds are issued, and the full faith and credit of the county shall not be pledged therefor, nor shall any ad valorem tax be levied for the payment of such bonds or the interest thereon, and such facts shall be recited on the face of the bonds.