If you are doing restoration work, have an expert match your old plaster for a compatible mix. Lime plaster is softer than cement-filled modern plasters. Remove dust and loose material, but don’t remove old plaster only because it seems soft. If you are working with a stone or brick finish, remove old, decayed or hollow lime plaster. Wear protective clothing, gloves and safety glasses while making or handling lime plaster, and remove any bystanders from the area before working.īefore beginning with lime plastering, prepare the wall to be finished. WARNING: Lime plaster contains alkaline materials that easily burn skin and eyes. It is a common finish for small cottages, and modern eco-friendly builders use it as an ideal finish for hay bale or earth building. If you find any gaps or recesses, these can be filled with wall filler, sanded, then touched up with paint.Lime plaster has the unique quality of being able to absorb and hold rain, allowing it to evaporate back into the air rather than allowing it to soak through the wall. These can be sanded down with fine sandpaper (make sure you wrap the sandpaper round a plane surface to ensure you get a flush finish), and immediately painted over. If you do find any unsightly ridges or lumps, don’t panic. As you’re applying the first coat, you may notice slight blemishes or bumps which weren’t apparent on the raw plaster. Since new plaster is a smooth, low-friction surface, a cheap or dilapidated roller can slip and cause an uneven finish. Once you’ve chosen your paint, make sure you pick the right tools for the job. If you’re painting lime plaster, it’s once again the best choice, as it is both fully breathable and emission-free, meaning there’s no risk of a reaction between the chemicals in the paint and the drying plaster. With all our paints, water thin by 20% to act as the mist coat onto bare plaster. You can still use the Graphenstone Premium over lime, and have access to brighter colours. Have a look at our natural lime paint range for more options. It can take over six months for the plaster to fully dry, but, if your paint is porous and breathable such as Graphenstone Ecosphere then you can paint much earlier, as the water vapour isn’t sealed in. Just one square yard of 5mm-thick lime plaster can contain up to half a litre of water. When choosing a paint for lime plaster breathability is the key. If you are new to lime plasters and want to know the difference between lime plasters and gypsum standard plasters please click here. Lime plasters need to be able to breathe, so it is important that you have a tested breathable paint for lime plaster, whether it is a natural mineral based paint (that is suitable for painting over lime) or a true (made from lime) breathable lime paint. Plastic paints are not breathable, not even slightly. When you have lime based plasters, you need to choose a paint that is actually breathable, not just ‘greenwashed’ breathable that you see on almost all plastic paints these days also. If you want a breathable paint suitable not only for lime plasters, but also for all normal walls, just use the Graphenstone Grafclean. If you want something to replace a limewash, then use Ambient Pro. GCS Interior and GCS Exterior are the best choice for all normal lime walls, suitable for all heritage and traditional buildings. We can help guide what you need, how to do it, and how to improve your overall indoor air quality. If you have lime plaster walls, it is important that you use the right lime based paint so your lime plaster gets the breathability that it needs.
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