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Cheers! Doubt it was primed with anything other than the standard primer a cast iron gutter comes with. He also painted an extra section that was pre-painted with a gloss of some sort as it’s the OG gutter.
It’s not big deal but the insurance co want me to sign a thing to say I’m happy etc - I’ll have zero come back after I sign it.
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Personally I would be priming/undercoating the factory coating with a tinted primer/undercoat after cleaning/degreasing it and then using 2 coats of an exterior eggshell. Maybe overkill. If what you have is a single coat of eggshell over a factory primer I would be asking why it's been done that way.
Most exterior paints will 'guarantee' 8 years (for dark colours), that requires proper preparation. The details are normally printed on the label.
Extra Deep will refer to the base, it's a very dark colour so they start from a very dark (or deep) base colour.
Not sure on the differences in formulation between interior and exterior eggshell from Dulux but normally it should be weathershield if it's exterior paint from Dulux.
Was it primed first?