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I used my daughter's neon green on the front sight on my M&P, it really stands out now.
Testers fluorescent model paint worked for me
I bought a kit from Bright Sights, it is 7 paint colors and a cleaner. The white stays very true to color and no solvent has had any impact on durability. More in each bottle than you would ever need and 5 years later the paint is still good in the bottles. My experience has been good with the product. Never tried the luminous paint from them.