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Tip the water in the road gulley. All the gypsum will fall to the bottom in the trap and the water will flow out the drain. Put the remaining left over plaster in a bag and stick it in the bin.
If it's lime plaster it will be in a bucket and won't be tipped away anyway, as it can be stored with a layer of water on top.
Aunt_Maud
Plasterer question -
A plasterer just came to quote on a job. But said he was worried there was nowhere to dispose of water/plaster gubbins.
I assume you'd just put it down the storm drains in alleyways (really really watered down). I mean what am I supposed to tell him?
(technically not DIY but hey)