Me. Rev. Stat. tit. 36, § 1955-A

If, after notice of assessment and demand for payment, any amount required to be paid for any vehicle is not paid as demanded within the 10-day period prescribed in section 171, the State Tax Assessor, in addition to enforcing collection by any method authorized by Part 1 or this Part, may immediately notify the Secretary of State who shall proceed in accordance with Title 29‑A, section 154, subsection 5 to mail the required 10-day notice and suspend any registration certificate and plates issued for the vehicle for which the tax remains unpaid at the expiration of the 10-day period.