The advantage to the stops-rust paint is that it comes in quarts and professional comes in gallons only. I would go with stops-rust myself simply for this fact, because a contaminated quart of paint is much less harmful than a wasted gallon. Just my

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I have been buying the rustoleum professional paint in quarts from Lowes Home Improvement for a few years. Maybe your Home Depot store just prefers to stock it in gallons.

I have tried the regular rustoleum and the professional and just recently i tried Brightside boat paint and it is absolutely the best paint i have used for rolling and i used mineral spirits to thin it with. I would only use the rustoleum as an undercoating to build up the layers of paint and use the Brightside paint for the final top coating.It looks 10 times better and this is without getting to the polishing stage.