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You could always speak to the manufacturers technical advice people to be sure - all manufacturers of specialist construction products (and most of the non-specialist product manufacturers) employ experts to give advice to end users. Rather than y'know basing assumptions on a hunch and 5 minutes of experience.
Having just painted some steels the hammerite might potentially infere with the intumescent paint (primer, undercoat and topcoat) from doing its job.
Pretty shitty job getting it off though.