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Removing an old finish is not a one-grit job. The right sandpaper depends on whether you are cutting through thick paint, leveling bare wood, or simply removing the last traces of a stain or sealer. Start too fine and you will spend hours polishing a finish that should have been stripped. Start too coarse and you may create scratches that remain visible after staining.
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Identify What You Are Removing
Look at an edge, underside, or damaged area before sanding the whole piece. A clear finish such as varnish, lacquer, or polyurethane usually produces dust or small curls as it is abraded. Paint may clog the paper quickly, especially if it is soft or latex-based. Thick, brittle coatings may chip or flake instead of sanding cleanly.
If the finish is thick, gummy, or covering a large surface, chemical stripper or a heat method can remove most of it faster than abrasive paper. Sandpaper is still needed afterward to remove residue and level the wood. On veneered panels, thin trim, and antique furniture, aggressive sanding can remove the usable wood before the finish is gone. In those cases, begin with a scraper or stripper and use sanding as a controlled cleanup step.
Choose the Starting Grit
For most furniture and woodworking projects, 80 grit is the practical starting point for removing a sound film finish from flat solid wood. It cuts quickly without being as destructive as 40 or 60 grit. Use a pack of 80-grit sanding discs if you are using a random orbital sander.
Move down to 60 grit when the finish is unusually thick, hard, or uneven, or when you need to level paint ridges. Use 40 grit only for severe buildup, heavily damaged surfaces, or large solid-wood areas where speed matters more than scratch depth. Coarse paper can remove material surprisingly fast and may leave grooves too deep to erase conveniently.
Start at 100 or 120 grit when the old finish is already mostly removed, badly worn, or very thin. These grits are also safer for veneer and soft wood. If the wood is bare and only needs preparation for paint, 120 grit is often enough. Paint does not require a furniture-smooth surface, and sanding finer than 150 grit can reduce adhesion on some coatings.
| Starting grit | Best use | Main risk |
|---|---|---|
| 40–60 | Very thick finish, heavy damage, solid wood | Deep scratches and fast material removal |
| 80 | Typical varnish, polyurethane, and paint removal | Can still cut through veneer or soften edges |
| 100–120 | Thin finish, worn coating, paint preparation | Slow on thick or hard finishes |
| 150–180 | Final smoothing before many stains and clear finishes | Too slow for removing a complete finish |
Sanding vs. Stripper vs. Scraper vs. Heat Gun
Sandpaper is not always the fastest first step. On many pieces, the best result comes from removing the bulk of the finish another way and saving the abrasives for cleanup and smoothing.
| Method | Best for | Avoid when | Grit to follow with |
|---|---|---|---|
| Sanding only | Thin or worn clear finishes on flat solid wood | Thick paint, carvings, turned legs, thin veneer | Continue the normal sequence to 150-180 |
| Chemical stripper | Thick paint or varnish, detailed moldings, veneered furniture | Poor ventilation, or pieces that cannot get wet with residue | Start at 120, then 150-180 once residue is gone |
| Card or cabinet scraper | Removing softened finish, leveling small areas, curved surfaces | Very hard, thick paint over large flat areas | Often 150 or 180 directly |
| Heat gun with scraper | Thick, layered paint on solid wood trim and doors | Paint that may contain lead, near glass, or on veneer | Start at 80-100 to remove scorch marks and residue |
A sharp card scraper deserves more attention than it gets. It shaves finish and wood fibers cleanly instead of grinding them, does not clog, and makes no fine dust cloud. On curved aprons, chair parts, and flat panels with a few stubborn patches, a scraper can replace one or two coarse grits entirely.
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Starting Grit by Wood Hardness
The species under the finish matters as much as the finish itself. Softwoods such as pine, fir, and cedar have soft earlywood that sands away faster than the harder latewood bands, so coarse paper can leave the surface wavy and deeply scratched. Hardwoods such as oak, maple, and walnut tolerate coarser starting grits with less risk.
- Softwoods (pine, fir, cedar, poplar): Start at 100-120 for most finishes; use 80 only for heavy buildup.
- Medium hardwoods (cherry, walnut, mahogany): Start at 80-100.
- Hard, dense woods (oak, hard maple, hickory): 80 is a sensible start; 60 for very thick or tough coatings.
- Veneer of any species: Start no coarser than 120 after stripping, and sand by hand near edges.
Use a Complete Grit Sequence
Do not jump directly from 60 grit to 180 grit. The finer paper must remove the deep scratches left by the coarse paper, and a large jump leaves visible sanding marks. A useful sequence for a solid-wood tabletop is 80, 120, and 150 or 180 grit. For a heavily coated surface, use 60, 80, 120, and 150 grit.
After the finish is gone, inspect the surface under strong side lighting. Sand until the old coating is removed consistently, not until every discoloration disappears. Dark areas may be stain that has penetrated the wood rather than finish sitting on top. Removing that color completely may require removing substantial wood, and on veneer it may be impossible without causing damage.
Use 150 grit before most stains unless the stain manufacturer specifies otherwise. Some woods, especially pine and other soft species, can become blotchy if sanded too aggressively or unevenly. For a clear finish, continue to 180 grit when the surface feels uniformly smooth. Going to 220 grit is sometimes appropriate for a very smooth clear-coated surface, but it is not a cure for scratches left by poor earlier sanding.
How to Tell When the Old Finish Is Gone
Stopping too early leaves patches that reject new stain; sanding too long wastes wood. These checks help you find the point where the finish is actually removed:
- Watch the dust. Most old film finishes sand to a white or pale powder. When the dust turns the color of fresh wood shavings across the whole area, you have reached bare wood.
- Check the sheen in raking light. Hold a light low to the surface. Remaining finish shows as slightly shiny or smooth islands compared with the matte texture of sanded wood.
- Wipe with mineral spirits. A damp wipe makes the surface look roughly as it will under a clear finish. Leftover finish shows up as lighter, blotchy, or glossy spots. Mineral spirits evaporate without raising the grain.
- Try a drop of water. On bare wood, a drop soaks in and darkens the surface within a minute or so. Where finish remains, it beads or sits on top.
If you plan to paint, you do not need to reach bare wood everywhere. Sound, well-bonded finish can stay as long as it is scuffed and clean. For stain, all of the old film must be gone, or the stain will look patchy.
Grit Scales: CAMI vs. P-Grade
Sandpaper sold in North America may use the CAMI scale (plain numbers) or the European FEPA scale (numbers with a “P” prefix). In the coarse and medium range used for removing finish, the two are close enough that 80 and P80, or 120 and P120, behave about the same. They drift apart in the finer grits: P400, for example, is roughly comparable to CAMI 320. If you mix brands while moving between fine grits, check the prefix so you do not skip or repeat a step by accident.
Abrasive Types for Finish Removal
| Abrasive | Strengths | Best use |
|---|---|---|
| Aluminum oxide | Affordable, versatile, widely available | General sanding and moderate finish removal |
| Ceramic | Very hard, stays sharp under pressure and heat | Thick paint, polyurethane, and large surfaces |
| Zirconia alumina | Tough and long-lasting in coarse grits | Belt sanding and heavy stock or coating removal |
| Silicon carbide | Sharp, fine-cutting, often waterproof | Sanding between coats and wet sanding a finish |
| Garnet | Natural mineral that dulls quickly but leaves a soft scratch | Final hand sanding of bare wood, not stripping |
Look also for “stearated” or anti-clog paper when removing paint and old finishes. The dry lubricant coating slows the buildup of melted finish on the abrasive. It is a good choice for stripping, though some people avoid it on the final pass before water-based finishes and wipe the surface well afterward. For random orbital sanders, a variety pack of ceramic hook-and-loop discs covers the coarse-to-fine sequence in one purchase, as long as the hole pattern matches your pad.
Match the Paper to the Tool
A random orbital sander is efficient on broad, flat areas, but it can leave swirl marks if you press down, tilt the pad, or use worn discs. Keep the sander flat, let its weight do the work, and make overlapping passes. A mixed-grit hand sanding pack is useful for edges, corners, and final preparation.
Hand sanding is slower but easier to control around profiles, veneer, and end grain. Sand with the grain during the final passes. Across-the-grain scratches may be hidden by paint but often show clearly beneath stain or clear finish. For corners, fold paper around a firm sanding block rather than using only your fingertips; fingers create hollow spots and uneven pressure.
Use abrasives designed for the tool. Hook-and-loop discs are convenient for orbital sanders, while adhesive rolls or sheets work well on blocks and detail sanders. Aluminum oxide is a dependable general-purpose choice. Ceramic abrasives cost more but stay sharp longer when removing hard coatings or working on large surfaces. The cheapest paper is acceptable for a small project, but it often clogs faster and requires more frequent replacement.
Prevent Common Sanding Failures
Clean the surface before sanding. Dirt and wax can clog abrasive paper immediately. On old furniture, wax is a particular problem; remove it with an appropriate solvent or cleaner before using a power sander. Wear eye protection and a properly fitted dust mask or respirator, and connect the sander to dust collection when possible. Old paint may contain lead, especially on buildings and furniture finished before the late 1970s; test questionable coatings and follow local safety guidance.
Replace paper when it stops cutting. A worn disc encourages pressure, which overheats the finish, increases swirl marks, and can dish the wood. If paint melts onto the abrasive, let the surface cool, scrape off loose residue, and switch to fresh paper. Do not use a very fine grit to compensate for deep scratches; return to the previous grit and remove them evenly.
For final sanding, a fine-grit sanding sponge can follow curves and soften sharp edges, but it is not a replacement for a flat sanding block on broad panels. If you are preparing a large project, buying assorted sanding discs in several grits is usually cheaper than buying individual packs, provided the discs fit your sander and have the correct hole pattern.
Before applying stain or finish, vacuum thoroughly and wipe with a clean, dry cloth. Avoid soaking unfinished wood unless you intend to raise the grain deliberately. Any remaining dust, coarse scratches, or shiny patches will become more noticeable once the new finish is applied.
Frequently Asked Questions
What grit sandpaper removes varnish from wood?
For a typical varnish or polyurethane on solid wood, start with 80 grit, then move to 120 and finish at 150 or 180 before refinishing. Use 60 grit only for thick or very hard buildup, and start at 100-120 if the varnish is thin, worn, or over veneer. A chemical stripper is often faster than sanding when there are several heavy coats.
Can you use an orbital sander to remove polyurethane?
Yes. A random orbital sander with 80-grit discs works well for removing polyurethane from flat surfaces like tabletops and dresser tops. Keep the pad flat, let the tool’s weight do the work, and change discs as soon as they clog or stop cutting. Switch to hand sanding or a scraper near edges, on veneer, and on profiled areas where the sander can round over details.
What grit sandpaper should you use after the first coat of paint?
Use a fine grit, usually 220, or 180 to 220 for latex paint on trim and furniture. The goal is only to knock down dust nibs, brush ridges, and raised grain, not to remove the coat. Sand lightly once the paint has dried for the full recoat time, remove the dust, and apply the next coat. A fine sanding sponge works well on edges and profiles.
Do you have to sand to bare wood to restain?
To change the color with a penetrating stain, yes: stain cannot soak through an intact finish, so any remaining film will show as lighter patches. If you only want to refresh or darken the color without full removal, a gel stain or toner can go over a cleaned, scuff-sanded finish instead. Test either approach on a hidden area first.
What grit sandpaper removes paint from wood?
Start with 60 or 80 grit for thick paint on solid wood, then work through 120 and 150. Paint clogs paper quickly, so stearated or anti-clog abrasives help. For multiple layers, a stripper or scraper usually removes the bulk faster. If the paint may predate the late 1970s, test it for lead before sanding, since sanding lead paint creates hazardous dust.
Should you sand to 180 or 220 before staining?
For most stains on hardwoods, 150 to 180 grit is a good stopping point, because finer sanding can reduce how much stain the wood absorbs and make the color lighter. Going to 220 is reasonable for blotch-prone woods like maple or birch, or when you want a lighter, more even tone. Always check the stain label and test on scrap sanded the same way.
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