DB,
Howdy from another resident of the valley.
I paint my sights all the way to the top, but not on the top flat of the sight.
I have painted many front sights, but not the specific model you mention. You can double check what area is visible by sighting the revolver and either eyeballing it, or just doing a 'dry' run with the Testors, not worrying about sloppy work. i.e. just paint what you think needs it and then align the sights...note the area you want to paint, wipe off the Testors with a wet paper towel and repaint using a steady hand.
I still think you'll do well painting all the way up, because a proper sight alignment has the top flats of both front and rear sights aligned.
Tips:
Testors Orange Modeling Paint
Small Testors Brush
VISE the PISTOL to hold it steady! Less to worry about
Masking tape on sides and top of sight to frame your target area
Pull off tape before paint dries, so it doesn't pull off any chunks
Let Dry for a good couple of hours
Seal it in with a couple of coats of clear nail polish
*I find several light coats of paint with 20 min dry time inbetween yields a better result than globbing too much on in one fell swoop
Testors paint can be cleaned up with water, which is nice during application
Clear nail polish protects the Testors coat and is pretty resistant to a lot of gun solvents, but I'm still mindful of it while cleaning.
Can be removed with ACETONE if needed
Apologies for the 'brand x' shots. Recently painted my SW 360sc which came out similarly, but I haven't taken any good shots yet.
