Protect drawings and mixed media with appropriate fixatives and varnishes.
Use workable fixative for charcoal and pastel to allow further layering and a final archival spray for finished pieces. For watercolor and ink, use UV protective sprays and avoid glossy finishes that alter color perception unless desired. Test sprays in a ventilated area and follow manufacturer safety instructions. For paintings, choose varnishes compatible with the medium—acrylic varnish for acrylics, damar or synthetic varnish for oils after proper curing.