Somehow there seems to be an application for military use here. Make a shiny tank and the enemy just won't be able to see it. Or does the shiny magic only work on civilian buildings?
The problem I see with reflective camouflage is that it depends on the angle. At worst it reflects sunlight and can create flashes that can be seen from extremely far away. That's how signaling mirrors work.
If imitating the blue sky is what you want, just paint the thing blue. In fact, that part of the idea behind the "horizon blue" uniform of the French army during World War 1.