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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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โˆ™ 2005-06-09 17:59:19
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Q: 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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Related questions

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No, plaster of Paris and white cement are not the same. Plaster of Paris is a porous material that will disintegrate outside in the rain. White cement is more durable and should last outside in the rain.

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Marcite is a "plaster" made from marble dust and white cement. It's put on top of the gunite and gives the pool a smooth finish and bright luster.

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A reputed recipe for pool plaster on a gunite pool is 1 part white cement to 2 parts white (preferably quartz or silica) sand. You should probably also add a bonding agent to the mix to make sure that your new plaster adheres to the old. All of these can be found at pretty much any home repair or hardware store. Mix the dry ingredients first and then make a shallow depression and gradually add water till you have the consistency similar to chunky peanut butter. Add the bonding agent per the instructions on the package and you are ready to go. Good luck!

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From possibly to somewhat.

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