NTMOI.... Necessity, the mother of invention!
A few years ago, at his deer hunting camp (which means few deer, but coffee in the morning and an adult libation at dusk), my cousin had a can of orange glow paint (actually to warn snowmobilers of changes in trail direction...).
During an afternoon of impromptu range time, I realized that the front sight on one of my esteemed Model 15 S & W's, and the front sight on my three-screw Ruger 22 Single Six, were nearly invisible in the shade of the glowering woods.
He said, "Give this a try". So, I did. Using the awl on my Swiss Army knife to apply it from a bit of sacrificially-sprayed cardboard, and after wiping off the sights. Eureka! That spray can paint has lasted beautifully despite several cleanings of the revolvers ever since. Indeed, was quick and non-scientific.
For those who wish, sure, good to try various colors; and some no doubt better than others. Yet, to me, anything other than standard blueing/black on the front sight is an improvement.
Good luck to all - and, what a pleasure it is to be able to see front sight!
Now show us your fingernails. 
Just teasing you, Sir.
