How to Sand Drywall Before Painting: Smooth Walls Every Time (120–320 Grit Guide)

Fresh drywall may look smooth after mudding, but even small imperfections will stand out once painted. Sanding is the final step to achieving flawless walls and ceilings. Here’s how to do it right using the correct grit progression.

Why Sand Drywall?

Sanding levels joint compound, removes ridges, and feathers seams into the surrounding surface so they disappear under paint. Skipping or rushing this step can result in visible lines and rough patches.

Tools & Materials

• Drywall sanding pole or hand sander
• Vacuum with HEPA filter
• Dust mask, goggles, and protective clothing
• Wet/dry sandpaper sheets

Recommended Grit Sequence

• 120 grit: Initial sanding after joint compound dries.
• 150 grit: Smoothing edges and feathering seams.
• 220 grit: Final surface prep before primer.
• 320 grit: Optional ultra-smooth finish for glossy paints.

Step-by-Step: Sanding Drywall

1. Protect the area. Seal off doors and vents to prevent dust from spreading.
2. Start with 120 grit. Use 120 grit (50-pack) to knock down high spots and ridges.
3. Feather with 150 grit. Smooth seams using 150 grit (25-pack) for a seamless transition.
4. Finish with 220 grit. Prep for primer with 220 grit (100-pack) to remove any remaining imperfections.
5. Optional final pass. For high-gloss finishes, lightly sand with 320 grit (25-pack) before priming.
6. Clean up. Vacuum walls and wipe with a damp cloth to remove dust.
7. Prime & paint. Apply a high-quality drywall primer before your paint color.

Special Cases

For repairs, start with the same grit progression but focus sanding on the patched area to blend with surrounding walls.

Pro Tips

• Always sand in a circular motion to avoid visible lines.
• Use a bright work light at an angle to reveal imperfections.
• Consider wet sanding for smaller areas to reduce dust.

Aftercare

• Inspect after priming—touch up with fine sanding if needed.
• Store sandpaper in a sealed container to keep it dust-free.

FAQs

• Do I need to sand between paint coats on drywall? Yes, for the smoothest finish—use 320 grit between coats.
• Can I use a power sander? Yes, but be careful not to over-sand and damage the paper surface.

Watch & Learn

For flawless drywall prep, stock up on the right grits. Shop all wet/dry sandpaper sheets now.