Do I need to use an undercoat before using rustoleom combi colour. Or is it self priming

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We recommend Rust-Oleum 3369/3380 CombiPrimer Anti-Corrosion for bare ferrous metal surfaces and Rust-Oleum 3302 CombiPrimer Adhesion for bare non-ferrous surfaces, prior to application of Rust-Oleum CombiColor.