keep pH at 6.9-7.2???

The guy that has the plaster part of the company that did our remodel is trying to convince me that with fresh plaster, it is a good idea to keep pH lower than normal, between 6.9-7.2. Won't keeping it that low eventually cause other issues to arise such as scaling (I can't recall if it was high or low pH that causes that).

He did a product that is quartz based for our plaster...supposed to keep the darker colors looking better than regular plaster. It is nice and smooth to walk...

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