Due to a small oversight I need to build up a smallish width (by the height of the dooropening) of new plaster to match edge of the tiling - don't ask! Basically the tiles overlap slightly into an opening and the wall of the opening now needs to be built up to meet it.
The plaster at its thickest will be about 8mm thick tapering to nothing over about 10 inches. Can I just use finish plaster to do this and if so should I build it up in layers or do I need to use undercoat(?) plaster (browning?).
Many thanks
Nothing is how it was planned