How to effectively repair wall cracks using a putty knife
Category: Industry News
Release date: 10-10-2025
Summary: Use a putty knife to carefully cut open the cracks—go as deep as possible—and fill them with plaster. Make sure to pack it tightly and distribute it evenly.
How should you handle cracks that appear on walls? Below, a putty knife manufacturer shares several effective methods for addressing wall cracks.
1. Method for treating cracks in insulated wall panels: Use a putty knife to carefully cut open the cracks, making sure to go as deep as possible, then fill them thoroughly with gypsum plaster. Be sure to pack the filler tightly and evenly. Next, apply a bandage, muslin cloth, or white percale fabric over the cracked area, allowing it to dry completely before applying putty or proceeding with any additional finishing processes. If the cracks are particularly severe, you can also reinforce them by taping with kraft paper or newspaper—this method may provide even better results.
2. The reason for wall cracks appearing after filling cable channels with putty is that the drying speed and shrinkage rate of the cement mortar differ from those of the putty powder. By the time the putty on the wall surface has fully dried, the cement mortar inside remains partially wet, leading to cracking. For handling wall cracks, using gypsum powder to fill the cable channels tends to yield better results.
3. Cracks can also appear if the wall putty is applied too thickly in one go, or if there’s an excessive variation in thickness across the entire wall—leading to severe cases where the material may even start to peel off. Wall crack treatment method: If necessary, apply multiple thin coats instead of a single thick one, allowing ample drying time between each layer. However, keep in mind that applying too many layers of putty can increase the risk of it eventually coming loose.
Keywords: How to effectively repair wall cracks using a putty knife
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