Refinishing a Wooden Chair With a Detail Sander: Protect Edges and Curves

Use a detail sander only on chair surfaces where its pad sits flat and steady, like a seat panel or a flat rail face. Hand-sand spindles, rounded edges, crevices and carvings. A flat powered pad can flatten round parts or round over crisp edges if you press hard or hold it in one spot.

Before any chair sanding, decide whether you are stripping an old coating or just preparing the surface. If the chair has old paint that might contain lead, stop and get guidance before you sand anything.

Choose the sanding goal before you start

Decide whether you are stripping away an old coating or merely scuffing a sound finish before touching the wood. Your choice determines how aggressively you sand and what grit sequence you need, while any suspected lead paint requires an immediate stop.

1. Name the job. Taking off an existing coating is a different job from scuffing a sound finish or smoothing bare wood. Removal takes more aggressive sanding. Preparation should take off as little as possible. Don't use one grit sequence for both jobs.
2. Read the directions for your new finish. Its surface-prep instructions tell you what the wood should be like when you're done. Your sander's manual covers grits and handling for that particular tool.
3. Stop if old paint might contain lead. EPA's guidance about old furniture notes that old furniture may have been painted with lead-containing paint, and it advises against removing lead-based paint yourself. The same booklet tells you to call your local health department about hobbies like refinishing furniture. Don't count on a hardware-store kit to clear the chair. EPA passes along a caution about retail lead test kits when they're used to check consumer products. Its recommendation to hire a certified inspector or risk assessor applies to testing paint in a home.
4. Know the scope of EPA's dust advice. For DIY renovation work involving lead-based paint, EPA's lead-safe work-area guidance says to keep the work area closed off from the rest of the home. It also lists power tools with HEPA-filter-equipped vacuum attachments as dust-control equipment. That page is written for renovation work on pre-1978 homes.

Use the detail sander only where the pad sits flat

Run the detail sander exclusively on flat, fully supported areas such as seat panels or broad rail faces. If the triangular pad rocks, overhangs an edge, or bridges a contour, stop and switch to hand sanding to avoid gouging.

1. Check the fit with the tool off. Set the pad on the surface. If it rests steady without rocking, bridging a curve or hanging over an edge, you can power-sand there. If it rocks or tips, that area needs hand-sanding. This is a practical geometry check, not a published standard.
2. Pick your grit from your own manual. The owner's manual for one detail sander, model 320.39598, gives these ranges: 80–100 grit for paint removal or rough prep, 120–150 for prep on planed wood, and 180–220 for sanding between coats. Those numbers belong to that model. They show that grit choice depends on the job, but they aren't a universal chair recipe.
3. Use even, light pressure and keep the tool moving. The same manual calls for uniform pressure. It says the sandpaper can heat up considerably when you sand one spot, so lift the tool off now and then to let the paper cool.
4. Stay off the edges. As the pad nears an edge, ease off and keep it fully supported on the surface. Don't tilt it to chase the edge.

Hand-sand curves and shaped profiles

Hand-sand every spindle, round rung, and carved detail along the grain to preserve its original shape. A flat powered pad easily deforms curved woodwork, so gentle manual pressure is the safest method for delicate profiles.

Picture a seat you can power-sand with a turned spindle right next to it. Furniture-sanding guidance warns that hard sanding with coarse paper can flatten or deform round parts, and that you should remove only the minimum of wood. For spindles and rungs, it suggests wrapping a narrow strip of fine paper around the part and pulling the ends back and forth, changing your angle as you go so you don't leave grooves. On carvings, sand lightly along the grain and press the paper in with your fingertips. In crevices, use a creased strip and slow, even strokes. For concave curves, wrap paper around a dowel the same diameter as the curve. On convex curves, press lightly with your fingers, and in every case watch out for the edges next to the area you're sanding.

Check the surface against the intended finish

Clear away all sanding dust and inspect the wood under good lighting against the specific surface requirements of your new finish. Different coatings demand different grit levels and textures, so address any rough or uneven spots before applying stain or topcoat.

• Brush off or vacuum up all sanding dust before you judge the surface.
• Compare the wood with your finish's prep requirements, such as whether it calls for bare wood or a scuffed existing finish. No single look, feel or grit guarantees the chair is ready for every product.
• If a spot doesn't meet those requirements, go back to it with the method that fits its shape: the pad on flat areas, by hand on contours.

FAQs

Are the grit ranges in the 320.39598 manual right for every chair?

No. They're task categories from one sander's manual. Choose your grits based on your own tool, the coating you're dealing with, and your new finish's directions.

Why does that manual say to lift the sander periodically?

It warns that sandpaper can heat up considerably when you sand selectively in one spot. Lifting the tool lets the paper cool. Moving off the spot also helps you avoid dwelling on one area of the chair.

Does EPA's RRP guidance cover refinishing a standalone chair?

The page doesn't say. EPA's pre-1978 RRP guidance recommends lead-safe certified contractors for renovation, repair and painting projects in pre-1978 homes, and it doesn't address single pieces of furniture. If you suspect lead paint on a chair, call your local health department.

Can I hand-sand the whole chair instead?

Yes, you can. The furniture-sanding guidance above describes hand methods for flat surfaces as well, using a padded sanding block and long, light strokes along the grain.