Sec. 12. To enforce a lien that attaches under section 11 of this chapter, a special tool builder must give notice of the lien in writing to the customer and the end user. The notice must:
(1) be delivered personally or by certified mail, return receipt requested, to the last known address of the customer and to the last known address of the end user; and
(2) state:
(A) that a lien is claimed;
(B) the amount that the special tool builder claims it is owed for fabrication, repair, or modification of the special tool; and
(C) a demand for payment.