You can add additional paint or finishes to your canvas, but we cannot guarantee any aftermarket finishes or paints applied to our products. Customers over the years have given us a few tips for applying finishes, which we can pass along to you. One tip is to always apply a fixative spray to the canvas prior to applying any paints. Another great tip is to test any paint pens or permanent markers to ensure ink is flowing properly before you begin to mark on the face or edges of the canvas.