Staff favorite! After extensive testing, we found the Krylon Gallery UV Archival Varnish sprays to be the best for spraying delicate pieces like watercolor and prints. We tested it on several watercolor pieces and there was no bleeding of the colors. This spray varnish offers advanced, non-yellowing protection against fading, dirt, moisture and discoloration. It contains UV light absorbers and stabilizers. Removable for conservation purposes. Protects acrylic, watercolor, oil pastel, colored pencil, oil and more.