While a 2" Chief's front sights are there for aiming, most shots fired in anger from them are not done so at eye level - at least I would think. This is more of a point & shoot self defense weapon.
That said, Testor's Model Paint Co. sells their paint in 1/2 ounce bottles that are available in just about any Hobby or Craft's store. In my neck of the woods, Michael's Craft store has a large selection of colors and I buy the bright orange/red color. (don't actually remember the name of the color - sorry) and since it's very late I am not running downstairs now. You are able to choose between a huge variety of colors and because they are under $3 bucks a bottle you can get a few to play with.
When you get the bottle home and BEFORE applying the paint, use some Alcohol to thoroughly clean any oil or solvents from the front sight. Look at Revolvers that have had the factory red ramp installed and mimic the area covered with your paint. Apply 2 or 3 thin coats with a tooth pick (not a brush) allowing each coat to dry over night before re-applying another coat. I find this brand of paint to be very well suited for gun sights and lasts many many years.
My choice of solvent/cleaner is Rig #2 and this particular product does not seem to effect the paint much. After 8 or 10 years if needed, I'll take a new single edge blade and carefully remove the bulk of the old paint and use a toothbrush with paint thinner to get off the rest. A dental pick (or similar) can be used to remove any stubborn specs left in the groves. Clean off once again and re-apply new paint. Like I said, it lasts a long long time! the little 1/2 ounce bottles will dry out way before you ever even use half the bottle!
I find this method works very well and this way your revolvers do not have to be permanently altered. Just as a note...... the older model Chief's with the 1/10" width front sight blade will not hold the plastic inserts as well as the newer 1/8" ones do. The older J's did not come from the Factory with these sight inserts because of this. Years back I did an older Chief's myself and once in a while I'd notice the little insert was missing and had to re-do so on your model which should have the older thinner sight blade, the paint is probably a better method.