If you can’t see the sights on your snub, you can’t use them. While there are some ways gunsmiths can put better sights on a snub, careful application of paint and perhaps Magic Marker can go a long way to improving your ability to see the sights. Most snubs’ sights are not of a color to contrast against the target. The lack of contrast makes it difficult to pick up a quick visual reference. Fire trucks and school buses aren’t painted blue or silver for a reason. Silver generates glare easily and blue doesn’t contrast against a dark target nor in limited visibility.
Colored nail polish or paint is an old trick to increase the visibility of the front sight. If you paint the sight first with white paint as an undercoating, the color will stand out much better. Degrease the sight before applying paint to ensure the paint sticks. Let the white paint cure completely and then apply the color paint over the white.