Bright Sights ain't a bad product. It's a little tempermental to apply, is a bit pricey and the glow in the dark versions stink.
Having said that I have a set and sometimes use it.
However I know of something much better and easier.
Testor's Paint Markers
Real Hobby/Model Enamel in a magic marker style pen.
Available at most Hobby Shops for $3.29 retail.
Also order online from Walther's
The colours are,
2503 Paint Marker -- Gloss Red
2508 Paint Marker -- Gloss Light Blue
2511 Paint Marker -- Gloss Dark Blue
2514 Paint Marker -- Gloss Yellow
2524 Paint Marker -- Gloss Green
2527 Paint Marker -- Gloss Orange
2538 Paint Marker -- Gloss Gray
2540 Paint Marker -- Gloss Brown
2544 Paint Marker -- Metallic Gold
2545 Paint Marker -- Gloss White
2546 Paint Marker -- Metallic Silver
2547 Paint Marker -- Gloss Black
2549 Paint Marker -- Flat Black
2575 Paint Marker -- Flourescent Red
You can color a front sight in less that 30 seconds. It's a breeze to apply even to a somewhat dirty gun. It lasts fairly well and is easy to touch up.
And one marker will last you almost a lifetime as long as you keep the cap on. I have some that are 10 years old and they still work great.
The flourescent Red and other bright colours age great for handgun sights and the gold and silver are the best for touching up those old Winchester and Marlin bead front sights.