Depending on how much time you have to do the correction... Daniel Smith makes a Watercolor Ground that can be painted onto watercolor paper and when dry will accept paint very happily -- great stuff! Margy Nelson > -- Margaret C. Nelson, Ph.D. Rumford Graphics Scientific Illustration www.margynelson.com [log in to unmask] 607-257-7144 Need to leave or subscribe to the Sciart-L listserv? Follow the instructions at http://www.gnsi.org/resources/reviews/gnsi-sciart-l-listserv