Painted sails, now that is interesting!
Is the sail in the picture really painted? Wow! Any information to share, like cloth in the sails, how to clean them, how to apply the paint and what paint to use? Durability?
It was a Mylar sail painted with automotive paint with a plasticiser added (the same type of additive they put in the paint when they paint plastic bumpers and what-nots). They've had some trouble with the solvents in the paint weakening the stitching in the sails - but seem to have resolved that.