RE: Race sails
there is a big difference between laminated monofilm vs painting.
EVERY sail that I can think of uses laminate monofilm at least in some areas - such as X-ply. But I only see one sail covered in a layer of paint.
For the 'glue' laminates that you talk about, I own 8 of those sails and at least based on my experience, they do not seem to crease and seem more stable. One thick single layer of monofilm seems more brittle and hence more susceptible to creasing. I don't think the benefits of laminated films are fully and widely understood.