I was sitting on my front step looking at these metal butterflies I had installed six years earlier. They had this open scrollwork I guess you would call it, naturally I felt compelled to fill those spaces with polymer. I remember researching about outdoor use and most said to stay clear. I figured it was worth a shot, I could always remove it if ti faded or degraded. I have to say it has held up remarkably well! We get nice hot summers and damn cold winters and these are screwed into the brick so they have been in place to see it all (on a west facing wall).
When they first went up it was a variety of marbled purples, copper, green and white. The copper, green and white look the same today as they did then. The purples however have shifted to blues which I find quite curious since usually red pigments are so much stronger and more lightfast. Still looks good to me so there they stay.
Time to go look up what everyone is looking up at …