I recall Keith mentioning that gold bead sights with rounded faces tended to do that, I dont recall him mentioning it with regards to the red ramp sights. Ive had pretty good experience with the factory red ramp sights, but they are a bit dark for my taste at this point, ive been painting them bright orange.
Dad had a pistol with a front fiber optic sight. I thought it was pretty cool, however i noticed it wasnt as easy to see in various lighting conditions as the sights painted with the Traffic Cone orange nail polish with white base coat. i removed the fiber optic front sight and put a regular one on and painted it orange. I do the white base coat and one thin top coat of orange, it seems brighter that way.
I use acetone for de-greasing, walmart has it in the nail polish area, its also marketed as nail polish remover, and can be had pure acetone or I think possibly with fragrance added. When painting in dots, lettering or sight markings, I fill the low spots, let it sit a minute until not quite fully cured, then use a q-tip with acetone to clean up the surrounding areas. It has worked pretty well once you get the hang of it. Painting in the sight markings on A2 sights makes them hugely easier to see to adjust as needed for range.
In my normal life I do a dusk skunk patrol around my place with the dog. Normal iron sights completely disappear in the failing light, but the orange on my pistol and Winchester carbine sights stands out very well long after black sights are impossible to use. It wears over time when pocket carried or carrying the carbine around, I just clean it off with the acetone and re-do it once a year or whenever it gets chipped up.