Maybe dusty is the wrong word, perhaps dry. Definitely cement though from the marmox website "each side faced with fibreglass mesh embedded into a cement polymer mortar". Yes definitely Marmox.
Bal APD primer not doing its job on Marmox and Impey waterguard
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benchwarmer
100% don't prime
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Did two tests with neat and diluted. Diluted was better but not as good as unprimed. I phoned Impey and Marmox and they both said priming isn't necessary. Glad I sorted that before priming the whole room and having my tiles fall off a few months later! Being an amateur I just assumed everything supplied in the kit was to be used.