Can anyone tell me or point me to a post that discusses the difference between the Rustoleum professional "high performance" paint as opposed to the qt size "Stops rust" paint. I am having a time trying to find the "high performance" sunburst yellow. The only place I've found it was acehardwareoutlet.com and they only sell it as 2 gallons. Would I gain anything by getting the "professional high performance" stuff.