I have been using bright red model paint on front and white liquid paper on the rear to help line my sights up.
Today I went to Walmart, before reading your post, the looks I got from the women in the nail polish isle. Not for picking out a Neon color nail polish, but how I was going about choosing from the various neon colors. Using a nearby shelf that had a black bag of some sort, stepping back just over arms length, making a "V" with two fingers, closing one eye, and looking at the nail polish. I choose a polish that resembles hunter orange.
Then I went to the arts and craft section and did the samething with neon tube paints, around half the price of the nail polish.
Left Walmart heading to the range to check out a muzzleloading rifle I picked up at last weekend's gun show. The neon hunter orange nail polish work great.