Conner, I don't get that, why on earth would they make a primer that doesn't work with their own paint? Just doesn't make sense to me. Is this from experience or heresay? I'm not saying your wrong, I just don't see the value in such a product as primer is generally accepted as a base for other paint layers. I looked at a can of it about a week ago and don't remember seeing a warning saying anything like "use only with XXXXXX topcoat". Thanks for the warning though, I'll investigate it before proceeding.
Both are compatible with their topcoats. However, Rusty Metal Primer should only be used on metal that is rusty. If the metal isn't actively rusting go with the Clean Metal Primer. Using Rusty Metal Primer on clean metal is where you will get problems because the Rusty Metal primer is designed to soak into/bind to rust and will not do so on clean metal.
The condition of the metal, not the topcoat, is the limiting factor here.
