Rubber cement over stencil, then watercolor over the dried rubber cement. Looks like a fun, easy project. Wonder what it would be like with a background stencil (swirls or chevrons)? And then use ROYGBIV or an ombre effect, which should be easy to get w/ watercolors. Gotta try this!
You gotta check out this amazing transformation! A beat up cane chair, thrifted online, ends up with a gorgeous two-tone chevron fabric and paint makeover! Thrifted Cane Wingback Chair Makeover by www.freshcrush.com