Spread the plaster with strokes that vary in length and angle.ĭon't worry about covering every square inch evenly. Apply a thin coat of plaster while holding the trowel at a 15- to 30-degree angle to the wall. Starting at a corner of the room, apply the plaster to the surface using a flexible steel trowel or a 4- to 6-inch-wide drywall knife. Open the can of Venetian plaster and, if necessary, add the tint. Mix the Venetian plaster thoroughly before each use.Wear eye protection if you are spreading the Venetian plaster overhead.You may want to wear gloves when mixing and applying the plaster, as it can irritate the skin.To avoid this problem, round over the corners of the tools with 100-grit sandpaper. Steel trowels and drywall knives may have sharp corners that can leave lines and scratch marks on the plaster.Read the instructions on the can of Venetian plaster carefully for any additional preparation requirements. Glossy paint surfaces can be plastered over, provided that you first sand the surface lightly to remove the sheen.The Spruce Home Improvement Review Board. Lime plaster will be found mainly on older buildings. If you have a lime plastered wall that has been painted with a modern paint then you will need to remove all the paint and repaint with a lime based or breathable paint. Most modern paints form a skin over the surface of the wall and if used on a lime plaster wall it will prevent moisture absorption and cause the paint to bubble, crack and flake away. If the new plaster wall in question has been plastered with a lime plaster then you must use a breathable paint, lime plaster acts like a sponge with moisture in the air and needs to breathe. With a good quality paint it will take less coats and also last longer and look better. If you use a cheap paint it will take more coats to cover and won’t last as long as a more expensive paint. What paint to use? It really depends on your budget and you get what you pay for with paint. Using the same technique used to prime the new plaster, apply the paint to the wall. When the filler touch ups have dried, shouldn’t take too long, your new plaster wall is ready for its finish coats. It’s best to use watered down paint on filler because like the new plaster, filler can suck the moisture from the paint too. Once the filler has dried, sand it back using some sandpaper and touch it up again with the watered down paint. Mix up some filler and using filling knives apply it to any cracks or holes that you can find. Rarely will you find new plaster that doesn’t need a little filling here and there. Once the paint has dried your new plaster wall is ready to be filled. This first coat is sometimes called a mist coat or primer. As the paint is quite watery you will get a lot of over spray from the roller, so go slowly and make sure to work the paint into the new plaster by rolling backwards and forwards over the same area before reloading the roller with paint again. You should use a medium to tight roller sleeve for this. Once the new plaster has been ‘cut in’ use a paint roller and tray to roll out the rest of the wall. Using a brush first, cut in the wall with the watered down paint.Ĭutting in essentially means to go neatly around the borders of the new plaster, or any other type of surface, using a brush. A drop sheet is any kind of covering that is used to protect floors furniture etc and catch over spray from a brush or roller.īefore painting new plaster, if you look closely you should find little bits of excess plaster here and there in the form of blobs or drops, they are hard to see but will stand out when the wall is painted so using a paint scraper knock off all the bits you can find. Before you start painting new plaster make sure to put down plenty of drop sheets at the foot of the wall. To combat this get a water based paint and water it down about 50%, you don’t need to be exact with your measurements, the more water the better. With painting new plaster, because it is so dry, if you paint a standard water based emulsion straight on then the new plaster will suck the moisture from the paint and the paint will then flake off the wall. You can use these if you like but there is no need. There are products you can buy that are designed for painting new plaster as a primer. Use the moisture meter on a few different areas before painting new plaster and if you get the green light its good to go. If you are unsure whether the new plaster is dry enough to paint over then rent a moisture meter from your local hire centre. It can take a couple of days to a couple of weeks for new plaster to dry out properly depending on what its covering ie plaster board wall or exterior block wall.
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