Sandpaper for Wood: What Actually Matters

Sandpaper selection has gotten complicated with all the options and marketing claims flying around. As someone who burns through sheets weekly in my shop, I learned everything there is to know about what works and what’s a waste of money. Today, I will share it all with you.

Grit Numbers: The Only Thing That Really Counts

Lower number means coarser paper with bigger particles. Higher number means finer paper with smaller particles. That’s basically it.

• 40-60 Grit: Aggressive material removal. Stripping old paint, knocking down really rough surfaces. I use this maybe once a month.
• 80-120 Grit: My workhorse range. General shaping and smoothing. This is probably 60% of what I use.
• 150-180 Grit: Final sanding before finish goes on. Gets rid of the scratches from the coarser grits.
• 220-400 Grit: Between coats of finish. Light touch here — you’re just knocking down nibs and roughness.
• Above 400: Polishing. Not something I use often, but it creates that glass-smooth feel when needed.

What the Paper’s Made Of

Probably should have led with this section, honestly. The backing matters more than people think.

• Paper: Most common. Works fine for hand sanding. Comes in different weights from light to heavy.
• Cloth: Tougher, more flexible. I use cloth-backed on my belt sander and for contoured surfaces. Lasts longer than paper.
• Foam: Bendable enough to get into curves and corners. Great for molding work.
• Film: Thin, consistent, cuts beautifully. My choice for final finishing work.

The Gritty Stuff Itself

That’s what makes abrasive choice endearing to us woodworkers — different materials cut differently.

• Aluminum Oxide: Industry standard for wood. Sharpens itself as it wears. Long-lasting, affordable.
• Garnet: Natural mineral. Cuts a bit softer, leaves a nice surface. Good for final sanding by hand.
• Silicon Carbide: Sharper, harder. I use this on finishes between coats and occasionally on very hard woods.
• Ceramic: The expensive stuff. Aggressive cutting, long life. Worth it for rough shaping heavy stock.

How to Actually Use This Stuff

I’m apparently one of those people who insists on sanding with the grain, and 80 grit followed by 120 then 180 works for me while skipping grits never did.

• Rough Work: Start coarse, remove the big problems. Don’t try to finish with your starting grit.
• Smoothing: Middle grits take out scratches from coarser paper. This is where most of the work happens.
• Final Prep: Fine grits before finish. Light pressure, following the grain.
• Between Coats: Very fine, very light. Just enough to give the next coat something to grab.

Picking the Right Paper

Think about what you’re actually doing before grabbing whatever’s closest.

• Shaping rough wood? Start around 80.
• Smoothing for finish? Work through to 180 minimum.
• Hardwood? You’ll go through finer grits than softwood.
• Machine sanding? Use cloth or film backings. Paper tears on belt sanders.

Technique That Works

• Follow the Grain: Cross-grain scratches show through finish. Always sand with the grain direction.
• Use a Block: For flat surfaces, wrap paper around a block. Your hand alone creates dips and waves.
• Progress Through Grits: Each finer grit removes scratches from the previous. Skip a step and those scratches stay.
• Don’t Oversand: Too much fine-grit sanding burnishes the wood, closing pores. Finish won’t penetrate properly.
• Clean Up: Dust between grit changes. Old abrasive particles scratch the work you just did.

Mistakes I’ve Made (So You Don’t Have To)

• Started too fine, had to go back to coarser paper anyway.
• Jumped from 80 to 180, spent forever trying to hide the 80-grit scratches.
• Forgot to sand edges, finish looked terrible there.
• Ran my random orbit too fast, scorched cherry. Slow down on dense woods.

Storage and Care

Keep sandpaper dry. Humid storage warps the paper and dulls the abrasive. Store flat or on rolls. Creased paper is useless paper.

Knock dust off periodically while working. Clogged paper cuts poorly and heats up. Label your grits clearly — grabbing the wrong one in the middle of a project is frustrating.

Sandpaper seems simple until you’ve made enough mistakes to understand it. These lessons came from my shop floor. Hope they save you some time in yours.