Flexiglow UV Reactive Neon Paint
 

Flexiglow's Reactive Neon UV Paint come in 15ml bottles, complete with
applicator brush, apply in a thick clear liquid, dry to a transparent and
barely visible coating, and only require a blacklight or UV light to
excite the colours. The green and yellow paints are definitely the most
dominant of the 3 colours available, providing a very intense and strong
glow. The blue follows close behind but with a paler shade than I
expected.

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