Re: Jo Sonya Polyurethanes -- How Non-Yellowing; Fine Art Use?
The Jo Sonja Varnishes are indeed non-yellowing and applied correctly, will hold up as well as well as the Atelier Water-Based Finishing Varnishes, but there are differences: Jo Sonja's Polyurethane Water-Based Varnishes will be tougher and more rigid from the polyurethane, as would be practical for a paint and varnish system primarily designed for the decorative arts market, which historically paints on hard surfaces. Atelier Medium & Varnishes provide a protective acrylic coating that is more flexible, which would be practical for fine artists that paint on paper or canvas that needs to be rolled. As a manufacturer, we purchase the components for our products from top suppliers who independently test the ingredients for lightfastness, non-yellowing, strength, flash point, etc. Chroma's own testing is real-time, done by artists who sample materials for us in a variety of circumstances. To date (over 20 years) we have not had single complaint that any properly applied Jo Sonja Polyurethane Water-Based Varnish or Atelier Medium & Varnish has yellowed.