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Art Deco lady needing a plaster cover!

The house is an Art Deco house. We had to take a ledge/deck off the house as this was rotten. There has been cladding put up but needs to be covered in a render. The area is only about 100mm in height but goes around the perimeter of the lounge which would be about 6x6m. The house currently has a swirl on the render. It doesn't matter if can't be done, would look better though. The photo shows before ledge was taken off. Thanks Andrea