We recommend using a high quality acrylic non-yellowing varnish on YUPO, such as Lascaux Fixativ or Krylon Crystal Clear.
Lascaux Fixativ is a transparent, pure, thermoplastic, acrylic resin fixative that has proven successful for many uses, especially for conservation. Lascaux Fixativ is suitable for fixing pencil, charcoal, pastels, wax crayons, watercolors, Indian ink, tempera, photos, lithographs, art prints, rub letters, gold leaf, etc.
Lascaux Fixativ is a transparent, pure, thermoplastic, acrylic resin fixative that has proven successful for many uses, especially for conservation. Lascaux Fixativ is suitable for fixing pencil, charcoal, pastels, wax crayons, watercolors, Indian ink, tempera, photos, lithographs, art prints, rub letters, gold leaf, etc.