I sent a shower of spray from the fixative over the canvas, and said: “Well, go on.”
1640s, from fix (v.) + -ative, suffix meaning "of or related to; tending to." As a noun, from 1870.
fixative fix·a·tive (fĭk'sə-tĭv)adj. Serving to fix, bind, or make firm or stable. n. A substance used for the preservation of tissue or cell specimens.