11.  Why do you put
                masking tape on the watercolor paper's edges? 
         
        Basically, because I like an edge in which to wipe
        off the excess water and paint.  I do not do it to create white
        borders.
                Also, it can help hold the paper on to its
                backing board--whether stapled to a wood backing board or a
                painting block. 
                I simply apply standard masking tape (not
                painter's tape) to the "dry" paper edges.  This
                is not intended, necessarily, to prevent the paint from leaking
                on to the paper underneath the tape.  If if does, it
                shouldn't matter, as the edges will eventually be covered with a
                framing mat.
      |