Principal contractors and all other persons personally liable for the debt for which the lien is claimed shall be made parties to actions to enforce liens under this article, and service of summons shall be made either personally or by publication in the same manner and with like effect as is provided by law in cases of attachment and other proceedings in rem.
C.R.S. § 38-22-115
For service of summons in attachment or other in rem proceedings, see C.R.C.P. 4(e) to 4(g).