I have a section of brickwork that needs plastering, about 5ft x 1ft, that runs up one side of a recess for a cooker. The right side has a decent lip of fireboard with a straight edge but the left side joins onto Yorkshire stonework. It will need to be curved into the stone work in places. I'm quite happy using bonding and building up the layers and confident of getting a nice finish around the stonework. This will save a few hours of the plasterers costs as some sections are will take a bit of time to work in. The house is 130 years old so I'd actually prefer this curved look rather than crisp sharp even edges. My question is, I can do the bonding now and it's another job off the list, then leave for the plasterer to add a nice even skim over this section and the rest of the wall, but it may be 3 or 4 weeks before the plasterer comes. Can a bonded finish be plastered over after that long or does it need to be skimmed within a limited period?