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There’s a guy on Facebook who sells cheap manual signal control boards that might work to allow you to illuminate them and change them periodically. https://www.facebook.com/share/ZkBAz9f2G11FiCqb/?mibextid=79PoIi
Let me see if I can find the article David Hughes did on Emory Grove -- track charts and all .. along with pictures -- It's in the BMX
... If you could find a way to make it stay like this, it could be useful for replicating ice crusted snow.
Wondering if water or alcohol thinned gloss medium would work for this using the same application method.