Sanding is an essential step in the process of finishing drywall. It helps create a smooth and even surface that is ready for primer and paint application. However, it is important to choose the correct grit sandpaper for this task. Using the wrong grit can potentially cause drywall to crack, leading to additional repair work. In this article, we will discuss the importance of choosing the right grit sandpaper and how using the wrong grit can impact the drywall.
Understanding Grit Sandpaper
Grit sandpaper refers to the abrasive particles that are bonded to the paper or cloth backing. The grit number indicates the size of the abrasive particles, with higher numbers representing finer grits and lower numbers representing coarser grits. Commonly used grits for drywall sanding range from 80 to 220, with 120 being the most commonly recommended for finishing.
The Purpose of Sanding Drywall
Sanding drywall serves several purposes. Firstly, it helps to smooth out any imperfections, such as joint compound seams or ridges left by taping. Secondly, it helps to blend the joint compound into the surrounding drywall, creating a seamless appearance. Lastly, sanding creates a slightly rough surface that allows primer and paint to adhere properly.
The Risk of Using the Wrong Grit
Using the wrong grit sandpaper can have adverse effects on the drywall, potentially resulting in cracking or damage. It is essential to understand the potential risks and consequences before starting any sanding project.
Using Coarse Grit Sandpaper
Using sandpaper with a grit that is too coarse can cause excessive abrasion on the drywall surface. This can lead to the removal of too much joint compound, causing the drywall paper to become exposed. Consequently, this weakens the integrity of the drywall, making it prone to cracking. Coarse grit sandpaper can also create scratches and gouges in the drywall, which can be difficult to repair properly.
Using Fine Grit Sandpaper
On the other hand, using sandpaper that is too fine may not effectively smooth out imperfections on the drywall surface. Fine grit sandpaper tends to remove a minimal amount of joint compound, leaving behind visible seams and ridges. This can result in an uneven finished surface that is not suitable for painting. Additionally, using fine grit sandpaper for extended periods can generate excess heat, causing joint compound to become too dry and crack.
Choosing the Right Grit Sandpaper
To avoid the potential issues mentioned above, it is crucial to choose the right grit sandpaper for your specific drywall project. The most commonly recommended grit for finishing drywall is 120. This grit effectively smooths out imperfections while maintaining the integrity of the drywall. It strikes the right balance between removing excess joint compound and creating a suitable surface for primer and paint adhesion.
Using the wrong grit when sanding drywall can indeed cause cracking and damage. Coarse grit can remove too much joint compound, weakening the drywall, while fine grit may not smooth out imperfections effectively. It is essential to choose the right grit sandpaper, with 120 being the most commonly recommended for finishing drywall. By selecting the correct grit, you can ensure a smooth, even, and crack-free surface, ready for the final touches of primer and paint.