We have a house in the country built in 2012, plastered inside and stuccoed outside. The interior plaster is a mix of white lime, white Portland cement, local sand, and water. I did not do the original plaster job, but I would like to repair a couple of areas that have cracked. The cracks are in places where we plastered over Magnesium Oxide board, a kind of cement board. Not sure why that has happened, but it's been stable now for several years, and I'd like to try a repair. My main question is about the ratios between the 4 ingredients, to get the right texture of the mix.
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