We installed large Lexan windows in our Gulfstar 9 years ago. I recently thought one window had started to leak at it's seal but found it was from a screw hole in the eyebrow above the widow.
Ultraglaze 5000 is a hi-rise structural sealant use to hold glass to hi-rise buildings. In black only, but then I can't think of any application where you would want any other color.