On Saturday, July 13, 2019 at 10:37:57 AM UTC-7, Bob La Londe wrote:
As near as I can tell most paints are out. 10-20 years max, and any UV
exposure reduces that dramatically.

I've bought steel roofing material with red (factory applied) finish that
has a 40-year warranty.

https://www.homedepot.com/p/Metal-Sales-12-ft-Classic-Rib-Steel-Roof-Panel-in-Red-2313424/204255145

Other permanent red for walls would be brick, terra-cotta tile, etc.
Stained-glass, too, weathers adequately. I've got a red-glass cup somewhere,
that grandmom got as a souvenir in 1895, in Atlantic City. No fading of color.