To avoid getting ridges from the edge of your knife when using putty or any other material, follow these tips:
Select the Right Knife: Use a flexible putty knife or a drywall taping knife with a smooth, straight edge. Avoid using knives with nicks or dents, as they can cause imperfections in the putty.
Keep the Blade Clean: Before applying putty, ensure that the blade is clean and free from any old putty or debris. This will help you achieve a smooth finish.
Apply Even Pressure: When spreading the putty, apply even and consistent pressure on the knife. Avoid pressing too hard, as it can create ridges and uneven surfaces.
Angle the Knife Properly: Hold the knife at a slight angle (about 30-45 degrees) to the surface you are applying the putty. This will help the knife glide smoothly and prevent ridges from forming.
Use Smooth Strokes: Spread the putty in smooth and steady strokes, covering the area you need to fill. Avoid using a back-and-forth sawing motion, as this can create unwanted textures.
Feather the Edges: To create a seamless transition between the filled area and the surrounding surface, feather the edges of the putty by gradually reducing pressure as you approach the outer edge.
Work in Small Sections: It's better to work in smaller sections, especially if you're not experienced with applying putty. This way, you can maintain better control and achieve a smoother finish.
Check the Lighting: Make sure you have proper lighting to detect any imperfections in the surface as you work. Shadows can make it challenging to see ridges or uneven spots.
Sand and Smooth: After the putty has dried, sand the area lightly using fine-grit sandpaper. This will help further smooth out any minor imperfections and prepare the surface for painting or further finishing.
Practice and Patience: Achieving a smooth finish takes practice and patience. Don't get discouraged if it doesn't come out perfectly the first time. With time and experience, you'll improve your technique.
Remember, it's always a good idea to apply putty in thin layers if you need to fill deep or large gaps. Allow each layer to dry before adding more putty. This will help you avoid excessive buildup and make it easier to achieve a smooth surface.