![]() ![]() Your call - but I would try it in your position. As the water evaporates from the plaster, it can lead to a phenomenon known as drying shrinkage. ![]() Shrinkage: Plaster is a mixture of cement, sand, and water, and during the curing process, it undergoes a chemical reaction that causes it to harden and set. But it is certainly not 'satin' or anything - yuck.). Here are some common reasons why plaster may crack: 1. As you can see in the image, I am having a problem with what appears to be peeling painted-over wallpaper on the surface of bare plaster. Look for compound, paint flakes, and other debris in the crack and scrape it out. Im renting a house that I like for the most part, but the old plaster - lath walls are proving to be a headache. Steps for Repairing Plaster Walls Start the project by cleaning up the crack with the utility knife. And it has a beautiful glowing whiteness about it whilst still being matt (it is matt 'though not as pure matt as matt 'emulsion' would be. Just looking for your expertise regarding dealing with old plaster walls. Do not vigorously scrape into the crack be gentle and go slow. While opening the crack may seem counterintuitive, you need to increase the area for the joint compound to stick. Even at a low angle I don't see patchiness or roller lines. Use a utility knife or painters 5-in-1 tool to cut along the edges of the crack, opening up the crack slightly and removing loose material. It went on more easily than ordinary emulsion paint, and the second coat easier still - it wasn't being 'sucked' or drying too quickly, so was pleasant to use. Once dried, I filled in the uneven paint layers and then rolled on Sandtex ultra-smooth masonry paint ( was on cracking offer from our hosts.) using a short-pile roller. This stuff is mainly design to bind chalky and dusty/flaky surfaces, but I used it on my bathroom ceiling to seal the exposed plaster and improve the adhesion of the subsequent paint coats. This is cheap stuff and watery - very easy to apply just roller it on. When I painted my 1949 textured plaster walls, (40 years ago), the top thin textured layer of plaster started peeling off in places as the paint dried. (So impressed that I also did an upstairs bathroom ceiling with Sandtex, and also the low wall and sloping ceiling of the adjoining bedroom).įor the bathroom - since I also had other issues with the cracking and small areas of peeling - after removing all the loose bits of paint I then rolled on Everbuild Stabilising Solution 406. This is your call, but this is what I did to our main bathroom which had long term issues with cracking and peeling ceiling paint, and the finish is really nice. (On that note, is there decent insulation above?) Lathe and plaster are usually pretty messy above after many years of dust and dirt accumulation, so possibly the plaster itself is 'discoloured' and this sort of percolates through to the paint layer from the normal moisture in a house (bearing in mind the air against the ceiling is always the warmest and hence the most 'damp' too. ![]()
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