> the coating withstood the challenging test of the harsh Australian sun, and showed no signs of degradation over the six months. Real-world optimal would be 2

> the coating withstood the challenging test of the harsh Australian sun, and showed no signs of degradation over the six months. Real-world optimal would be 25+ years - in environments with acid rain, bat/bird droppings, hailstones, heavy smog, ice dams, 65° C summers, and several other sorts of hazards. (Yes, that's a ridiculously big ask. OTOH, the planet we're stuck on is starting to char. And workable Planet B's are looking extremely scarce):