I have painted a lot of sights over the years using the Testors/toothpick technique. I put a Dawson FO on maybe 5 years ago and haven't looked back. I tried the 4-5 colors and found I like the yellow/green the best. At my basement workbench I can sight against a lot of different colors and I found that there, in the low light, the yellow works best. Outdoors I can use any color but in low light I think the yellow is best because it is closest to white. BTW I found that fiber is available in .040" and .060" diameters. Since a common 1/16" drill bit is .062, I drill out any FO sights set up for .040 and then use .060" FO tube.