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I think the initial problem with this paint is that it is a " modified alkyd ". Whereas the Brightside marine paint is a polyurathane and the Rustoleum / Tremclad shares most traits of an enamel.

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Most (if not all) the the Rustoleum type paints are alkyd enamels. They all share an alkyd resin base (as opposed to an acrylic one). It's a paint technology that dates to the late 1920s, but it obviously still works. It was used as an OEM paint finish until the late 1960s, when acrylic enamels came into use.

I looked at a can of the Rustoleum Marine paint and read the label...other than being a *lot* more expensive than regular Rustoleum, I couldn't tell you what the difference is. If someone had adhesion problems with it, they almost certainly would have had problems with any other alkyd enamel (including regular Rustoleum). I'd avoid it too, if for no other reason than the price...
For that money, get some Brightside or other urethane marine paint.