![]() I have seen plenty of old recoated lime plaster walls, so figured out how to do it. Plaster bonder is commonly used for recoating, which is really just a type of PVA glue that you apply, and it pulls water out of the top coat to make it bond. Experts will even tell you that it can't be. People don't believe that Lime Plaster can be scim-coated. You can see the circles where we started on one wall. It can be sanded, and that's how we remove centuries of dirt-with a power sheetrock sander. The breathing works against getting paint to stick long term. Long story shortened some, but the chemistry is really simple, and the lime used in the mix is Hydrated Lime (long story about variables of that too), and over centuries, it gives up the Hydrogen atom when it's replaced with CO2, turning it back into Limestone.īacteria doesn't grow on Lime Plaster, and it breathes. I have started using a few percent of White Portland Cement, and it makes it not only more durable, but waterproof. This added ingredient, to make it set up faster, doesn't require but a few percent of the total ingredients. Moisture makes gypsum plaster (also called Plaster of Paris, because that's where it came from, for a Long time, because of a large Gypsum deposit there). Some gypsum plaster had to be added, so it would set up in less than forever, but the more gypsum it has in it, the less durability it has against moisture. It was just one of the many steps in building that gave way to faster, and cheaper. Gypsum plaster was no improvement in quality. Here is a webpage about one room we redid. ![]()
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