Sanding joint compound requires the right sandpaper grit for efficient and smooth results. Generally, a multi-step approach is recommended, starting with coarser grit to remove excess compound and finishing with finer grit for a smooth surface.
Choosing the Right Sandpaper Grit
The process typically involves using sandpaper of varying grits:
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Coarse Grit (100-120 grit): Begin with this grit to remove the bulk of the excess joint compound. This is ideal for the initial sanding to tackle larger imperfections. Sources like The Home Depot recommend this grit for rough areas. (https://www.homedepot.com/c/ah/how-to-sand-drywall/9ba683603be9fa5395fab901fe5ada3) A Reddit user, however, found 100 grit too rough for finish sanding. (https://www.reddit.com/r/drywall/comments/ub4uhf/after_adding_joint_compound_and_sanding_for_the/)
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Medium Grit (150 grit): After removing most of the excess with coarser sandpaper, transition to this grit for refining the surface. This helps to create a smoother finish. This is mentioned as a target grit in multiple sources. (https://www.reddit.com/r/drywall/comments/ub4uhf/after_adding_joint_compound_and_sanding_for_the/)
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Fine Grit (180-220 grit): For a final, exceptionally smooth finish, use this finest grit. This is particularly useful for final sanding to achieve a polished look. (https://www.reddit.com/r/drywall/comments/ub4uhf/after_adding_joint_compound_and_sanding-for-the/)
Remember, the type of joint compound can influence the sanding process. Some compounds, like "EZ sand," might require adjustments to the sanding technique or grit due to its harder nature. (https://www.diychatroom.com/threads/going-to-try-powder-joint-compound.672153/)
Using a random orbit sander with appropriate grit sandpaper can significantly speed up the process. However, even with power sanders, clogging can occur, especially with coarser grits. (https://www.reddit.com/r/HomeImprovement/comments/13lir4g/sanding_joint_compound/)
