I'd seen Lee (M3-SRT8) touting the virtues of Spray 9 in his restoration threads, but it seemed to only be available on the East coast. Until a few months ago that is when I found it selling in 1 Gal. bulk containers for just a few bucks at a local Home Depot.
Apparently chassis is the plural of chassis
http://www.merriam-webster.com/dictionary/chassis