Do you know the background of red paint in ventilators? Nicro sells red or white - never seen another color, never an attempt to match the dodger (for instance). Why not blue?
I bought red Nicro ones a few years ago, but they quickly faded out. This year I'm repainting them red with Rustoleum (I had some), but the first coat took a week to harden up. I'm going to give them another week to cure then hit them with a second coat.