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Yes, I know the bit you mean, All Coat is perfect for that. Those sort of areas can get mould or mildew in them depending where they're situated. If there's public access they are horrible. Normally it's good jet wash them before painting.
All Coat is not really self-priming in that situation, I've seen early failure in exterior areas if it's not primed.
Airhead
It's to redo the lower part of the wall, what I wrongly refer to as the splashback