It is all too common for plaster to fill up electrical boxes and cause major headaches for the electricians during trim out. To avoid this, be sure to fully tape off all electrical boxes with red duct tape so that they will be well protected. The red helps locate them later should they get fairly well covered with plaster and the duct tape is strong enough to defend against a wayward trowel.
The time spent taping the boxes is well worth the effort as unplugging the small screw holes after the plaster has dried in them is more than a pain in the neck! I am about to try a cool idea on the house I am currently working on and if it works out, I will let you know. I think it may be a great idea for simplifying plastering around boxes as well as creating flush finishes with the trim out. Stay tuned…!