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Discuss Marcrist Core set with dust extract in the Electrical Tools and Products area at ElectriciansForums.net
One thing I found that helped with damp brickwork was to get the core started then SDS four holes 10-12mm at 12, 3, 6 and 9 oclock.Not keen on the idea of wet core drilling, the jobs are domestic bathrooms, and I'd imagine the clean up operation after 1 core will be a nightmare. There is no issue doing the core dry, it's just it takes around an hour on average and it's the wet/damp dust that slows things down, if the kit in my opening post brought that down to 30 mins, then happy days.