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Why is the plaster on a gunite pool gray in the middle and white on the gunite side and white on the outside?

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2005-06-09 17:59:19
2005-06-09 17:59:19

The finish plaster is normally white all the way through. It sounds like you are dealing with a pool that has been replastered by the method of putting a "brown coat"/"scratch coat" (the gray plaster you noted) over the original finish plaster surface, and a new finish coat of white plaster on top of that. The scratch coat more like a thin concrete than plaster (doesn't have the white marble dust in it) and is used to get a better bond to the old surface.

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