The full faith, credit and taxing power of any city or town issuing bonds hereunder for the purposes outlined in this article are hereby irrevocably pledged for the prompt payment of such bonds, with accrued interest thereon, as and when they become due. And the city or town council of such municipality shall levy annually a sufficient tax on all the taxable property within the limits of such city or town sufficient to pay such bonds, with interest accruing thereon, as they respectively become due, and the city or town clerk and treasurer shall collect such tax and apply the proceeds thereof to the payment of the bonds.