When peeling the tape off your watercolor painting, peel at an angle away from the painting.
By doing this, you lesson the chance of tearing off a layer of paper with part of the painting that goes with it.
Once you remove the tape from the edges it really brings the finished painting to life. No more tape, no more messy edges, no more messy board to which the painting is mounted. That little white paper edge virtually frames the piece for the first time.