Get any latex white paint, many will fluoresce right out of the can. If it doesn't, mix in some zinc oxide powder, which you can get at most drug stores. The more zinc oxide you add the brighter it fluoresces.
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Really ? That's a useful trick !
Use a cheap paint, the lower the ratio of pigment to vehicle the better and mix well. A paint dasher on a drill or a paint shaker are best.
White paint isn't. L
define best:most/least luminescent?degrades least quickly?