I don't know the details of painting the rides, but the Hangman at Wild Adventures, GA, has changed color every time I go back! It was pink, then orange, and then yellow. It's almost worth going to the park just for that kick. ;)
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html Check out the BEHIND THE SCENES of roller coasters!