Any bonds issued hereunder and at any time outstanding may at any time and from time to time be refunded by a county or municipality by the issuance of its refunding bonds in such amount as the governing body may deem necessary to refund the principal of the bonds so to be refunded, together with any unpaid interest thereon; to make any improvements or alterations in the industrial project or commercial project; and any premiums and commissions necessary to be paid in connection therewith. Any such refunding may be effected whether the bonds to be refunded shall have then matured or shall thereafter mature, either by sale of the refunding bonds and the application of the proceeds thereof for the redemption of the bonds to be refunded thereby, or by exchange of the refunding bonds for the bonds to be refunded thereby: Provided, That the holders of any bonds so to be refunded shall not be compelled without their consent to surrender their bonds for payment or exchange prior to the date on which they are payable or, if they are called for redemption, prior to the date on which they are by their terms subject to redemption. Any refunding bonds issued under the authority of this article shall be payable from revenues derived from the lease, sale, financing, refinancing, or other disposition of or realization from or upon the industrial project or the commercial project which was acquired, purchased, constructed, built or improved, or financed with the proceeds of the bonds to be refunded, or from other moneys or the principal of and interest on or other investment yield from investments or proceeds of bonds or other applicable funds and moneys, including investments of proceeds of any refunding bonds, and shall be subject to the provisions contained in section seven of this article and shall be secured in accordance with the provisions of section eight of this article.