Amazon.com: Rainworks Invisible Spray 2.0 Starter Kit (10-15 sq ft) Create Magical Art that Appears When it Rains, Rain-Activated Art and Water-Activated Street Art For Kids, Family, Fun, Schools, and Communities :
Rainworks invisible spray: Make secret street art visible only when it is wet - TheSuperBOO!
DIY Rain-Activated Signs, Images, Graffiti - Improvised Life
Invisible Spray 2.0 Professional Bottle (80-110 sq ft) – Rainworks
Creating Rainworks in Downtown Frederick • Downtown Frederick Partnership