How to Sand Wood Trim Before Painting: A DIYer's Guide to a Smooth, Professional Finish

Wood trim like baseboards, crown molding, and door casings can dramatically improve the appearance of your home—if they’re painted properly. The secret to flawless results? Sanding before painting. This SEO-optimized guide explains how to sand wood trim correctly, which sandpaper grits to use, and tips for saving time without sacrificing quality.

Why Sand Wood Trim Before Painting?

Sanding removes old finish, scuffs, and surface imperfections while helping primer and paint stick better. Skipping this step can lead to peeling, visible brush strokes, and uneven coverage.

Best Sandpaper Grits for Trim Prep

• 100–120 grit sandpaper: For removing old paint or minor dents.
• 150–180 grit sandpaper: Ideal for smoothing wood before primer.
• 220–320 grit sandpaper: For sanding between coats or prepping glossy trim.

Step-by-Step: How to Sand Trim Before Painting

1. Wipe the trim clean with a damp cloth or mild soap solution.
2. Start sanding with 100–120 grit to remove damage or existing sheen.
3. Use 150–180 grit to smooth wood and prep for primer or paint.
4. Vacuum and wipe clean with a tack cloth to remove dust.
5. After priming, sand lightly with 220–320 grit before applying final coats.

Tips for Great Results

• Use a sanding sponge to match the trim’s shape and contours.
• Always sand with the wood grain for a smooth surface.
• Apply light pressure to avoid rounding sharp trim edges.

FAQs

• Can I paint over trim without sanding? Only if using a strong bonding primer, but sanding is recommended for durability.
• Do I need to sand between paint coats on trim? Yes—for the smoothest finish, especially on glossy paints.

Watch & Learn

Shop the best sandpaper for trim at eQualle and discover more pro painting tips on our DIY blog.