Before making an appointment under the provisions of this act the court shall be satisfied that the proposed curator whose appointment is sought is a fit and proper person to be appointed. Upon the appointment being made the curator shall execute and file a bond to be approved by the court in an amount not less than the sum then due and estimated to become payable during the ensuing year. The said bond shall be in the form and be conditioned as required of conservators appointed under the laws of this state. The court shall have power from time to time to require the curator to file an additional bond. Where a bond is tendered by a curator with personal sureties, such sureties shall file with the court a certificate under oath which shall describe the property owned, both real and personal, and that they are each worth the sum named in the bond as the penalty thereof over and above all their debts and liabilities and exclusive of property exempt from execution.