I would try this and see if it helps, I have used Red nail polish as well, paints on easy and seems to hold up for a long time. We used to always paint our shotgun sights red. I am from up state NY and when hunting with snow on the ground it is kind of hard to see your white sights while trying to shoot a running snow shoe rabbit with the blanket of snow it is running on. They also make a bright yellow highlight type paint meant specifically for painting your sights. Maybe try that.