9/3/2023 0 Comments Cracks on plaster walls![]() The modern technique for plastering external corners usually incorporates a metal corner strip which generally protects then from damage. Between each application of filler, the surrounding surface should be lightly sanded and moistened before applying the next application. Mix a quantity of filler as per the manufacturer's instructions and before applying it, dampen (but don't soak) the inside of the crack using a small paint brush dipped in clean water.Ī filling knife to apply the filler along the line of the crack and press the filler into it - leave the filler proud of the surrounding surface.ĭip a clean filling knife in clean water and run it along the line of the crack to level the filler to the surface around it.įillers for this type of work usually shrink as they harden, and so after the filler has hardened, the filler within the crack may need to be built up using a number of applications. Using a dry paint brush brush along the line of the crack to remove any loose dust and dirt. ![]() Try to undercut the crack with the corner of the scraper to give a better key for the filler. The corner of a scraper or filling knife is ideal for removing any loose plaster and for opening up and deepening the crack. Small cracks in plaster should first be widened so that filler can be pushed right in and has something to key on to. Most small cracks will easily be covered by normal wallpaper but when walls or ceilings are to be painted with ordinary paint, the cracks will need to be filled before painting and this article deals with filling small cracks for this purpose. These cracks are not usually structural and can be hard to cover. These cracks can often look quite bad as they can cover quite large areas. In some older properties, the joints of plasterboard used for ceilings was sometimes not 'taped' before they were skimmed with plaster and this can lead to cracks where adjacent sheets meet.
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