Testor's model paint in the 1 ounce bottle comes in a plethora of colors and gloss values. IMHO it is better than nail polish (more durable). It cost about $2 bucks a bottle and will last just about forever. Please see hints below:
* mix paint or polish well prior to application
* clean front sight with alcohol and do not touch it after cleaning
* apply paint or polish with a wooden toothpick (not a brush)
* apply 3 thin coats instead of a thick one
* only paint area that would normally have the red insert in it
* do not try to clean up overage until the job is all finished
* when all dry, clean up edges with a razor blade
* if you don't like the color, simply remove with a razor blade and choose another one.
I used to cut dovetails in the front sights but haven't done than in decades! I find that the Testpr's paint is brighter, lasts a long long time, gives you the ability to remove it and restore front sight back to Factory if selling the gun, and there is no chance a novice will destroy the front sight blade which can not be replaced most of the time because it is integral with the barrel.
Before spending much more money on a dovetailed front sights with colored plastic inserts, TRY THIS FIRST! It's only a $2 proposition so there is no down side!