Thin coats / primed or not ?

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We've got a badly done mono that we are tidying up for a customer.
We've put a nice tight coat of Nivoplan all over it and will be spraying Mapei 1.5mm bucket coat over it to finish.
We always prime first but I've been told it's not necessary unless it's an old, dry background. We want it to pull in quick as well because the weather's a c**t at this time of year. What do you guys think ? Who's had experience of spraying without priming ?
ps I was gonna water it down a bit and the Nivo only went on yesterday and today. Cheers
 
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