Simon Semple, who developed this Black 2.0, has a video on using the stuff.
He makes a point of the longer drying time that it has, due to its chemistry, but that the stuff gets darker/more matt the long it is given to dry.
The paint seems to stick really well as you look at how he handles the test sheet that compares different black paints applied to aluminium foil. But it is not intended for being kept outdoors where it would be subjected to weather and direct and prolonged sunlight. How it would stand up to our use, being nocturnal and with occasional dew wetting, that needs to be seen.
Very interesting though.
https://www.youtube.com/watch?v=YuILnYJlWcI