adorn, decorate, grace, ornament, embellish, beautify - make more attractive by adding ornament, colour, etc.; "Decorate the room for the party"; "beautify yourself for the special day"

coat, surface - put a coat on; cover the surface of; furnish with a surface; "coat the cake with chocolate"

effloresce - become encrusted with crystals due to evaporation

harden, indurate - become hard or harder; "The wax hardened"