Demands for wages and all sums due under contracts or otherwise for the performance of all or any of the services mentioned in RCW 60.36.030 shall constitute liens upon all steamers, vessels, and boats, their tackle, apparel, and furniture, and shall have priority over all other demands save and excepting the demands mentioned in RCW 60.36.010 (1), (2), and (3), to which said demands the lien hereby provided shall be subordinate: PROVIDED, That such liens shall only continue in force for the period of three years from the date when such work was done or the last services performed by such stevedores, longshore workers, or others.