I'm entered in an art show in Newburyport, MA where the artwork had to be created on 8x8 stretched canvases. Any medium is accepted. This meant for me that my watercolor paper had to be adhered to the canvas and painted on in that form and shape. These pieces can't be framed (which works well for oil and acrylics, but not so much for pastel and watercolor). I found that working outside my usual routine of painting on paper and framing under glass, I could paint on the canvas, spray the work with an archival protective coat and have my work ready for the wall without frame and glass.
These are the two works I'm submitting today. The archival coating has not affected the color of the work. I'm really quite happy with the new option.