Firearms are designed to last for a long time. Vintage firearms abound today and most of them cannot be retrofitted with modern sighting systems.
Here's where Glow-On becomes relevant.
To purchase please go to:
Amazon.com: Glow-On Super Phosphorescent Gun Sights Paint: Sports & Outdoors
gun sights paint, glow in the dark paint items in Glow-On Store store on eBay!