(a) Persons entitled to avail themselves of the lien provided for in this chapter shall not be considered as waiving the same by granting a credit or receiving notes or other securities, unless the same be received as payment or the lien expressly waived, but the sole effect thereof shall be to prevent such persons from availing themselves of the liens provided for in this chapter until the expiration of the time agreed upon.
(b) Notwithstanding the provisions of any other law, except as provided in this subsection: