Is the word clad archaic when used as a verb?

One might get that impression, but we do use it frequently e.g. in describing construction materials, and in business and legal matters, as " an ironclad agreement ", implying a legal, enforceable contract. Using " clad " in describing someone's clothing being worn, may be termed " colourful " or even " quaint ". Archaic is a wee bit negative or objectionable label, to modern native English speakers.