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Would someone be kind enough to explain the composition and layers of interior plaster? In examining my old walls, I find a base coat (brown coat?) of what seems to be cement and sand, topped with pure, white, unsanded material (the finish plaster), which I have always thought was cement based.
I would like to replaster one section of wall. In looking through the aisles at Home Depot, the only materials I could find were: “California One-Kote” which describes itself as a gypsum based interior plaster – it’s a white powder, and seems to be pretty much the same as powdered gypsum-based drywall mud; patching plaster, and Plaster of Paris (what the heck is Plaster of Paris, anyway?). In any case, I don’t see materials which seem to be like those which make up the walls of my ‘40s house.
Could someone enlighten me? What exactly, comprises an old fashioned interior plaster wall? What is/are the base coat/coats? How are they typically applied? Is the usual interior finish plaster cement based, or gypsum based?
Thanks.
Replies
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Would someone be kind enough to explain the composition and layers of interior plaster? In examining my old walls, I find a base coat (brown coat?) of what seems to be cement and sand, topped with pure, white, unsanded material (the finish plaster), which I have always thought was cement based.
I would like to replaster one section of wall. In looking through the aisles at Home Depot, the only materials I could find were: “California One-Kote” which describes itself as a gypsum based interior plaster – it’s a white powder, and seems to be pretty much the same as powdered gypsum-based drywall mud; patching plaster, and Plaster of Paris (what the heck is Plaster of Paris, anyway?). In any case, I don’t see materials which seem to be like those which make up the walls of my ‘40s house.
Could someone enlighten me? What exactly, comprises an old fashioned interior plaster wall? What is/are the base coat/coats? How are they typically applied? Is the usual interior finish plaster cement based, or gypsum based?
Thanks.