The white under coat is the way to go, than anycolor will stand out , I kind of like hot pink
I have a Jericho that the front sight is terrible, one of these days I am going to see id I can drill a 1 or 1.5 mm hole length ways at the top and install sone red or green fiberoptic rod I have in it , Have to see id I have a drill bit that size and rig it up in the drill press.
another thing, if it is round/ sloped, file a sq. notch on the back side like a target sight, flat black or what ever, or cold blue where you filed.
combat sights are a problem for me.