Andre
Update: On June 11 I replaced the top left photo with a new one and hung in the same hangar. In two weeks it looked like below. I am (negatively) impressed. The green spots on the left are from the areas over which I pressed the button of a spray can with a "Print Guard" U.V. Water Resistant Lacquer. These colors are OK and this means that Print Guard works except for my poor skills in coating. The spray is transparent :-). Do you remember a pink glue that turned white after drying? This would help!