Gottlieb 'reds' protected with backing silver/masking faired better at times than a simple red or combination with white for translucent (lights behind it) areas. It may be a mass issue (many layers) or even deep penetration of UV through to the and back to the glass (who really knows). However, the Krause, Webb, Assad's of the world may very well know. I would not trust a minute with the word of the 'Cover your Glass' guys, a huge monumental failure in artwork protection advice designed in principle to profit rather than be tested and documented to work for years. Thus a old adage, "... pay attention to whom you pay attention ...".