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Dish-outs are shallow hollows left when sanding removes more wood from one spot than the surrounding surface. They show up readily on broad panels, especially in raking light or under stain. The fix is mostly controlled sanding: keep the abrasive flat, use a suitable grit, and avoid pressing down or dwelling in one place.
Why dish-outs happen
A small sanding pad, a tilted sander, or extra hand pressure can concentrate abrasion on a narrow area. The risk increases when you use coarse paper longer than needed, sand across soft and hard grain, or try to erase a deep scratch by working only over that scratch. On veneered panels, aggressive sanding can go beyond a cosmetic hollow and cut through the thin face layer.
Uneven glue, dents, and raised grain can also look like sanding problems. Before removing more wood, check the panel with a straightedge and inspect it under light shining across the surface. If the low spot is already there, sanding the surrounding area down to match may make the panel worse.
Choose the right tool for the panel
For most solid-wood panels, a random-orbit sander with a 5- or 6-inch pad is a practical choice. Its overlapping circular motion is less likely to leave straight grooves than a belt sander. A sanding block or long hand-sanding block is useful for edges, narrow areas, and checking flatness. A belt sander removes material quickly but is easy to tip or hold in one spot; reserve it for substantial stock removal, not final panel preparation.
| Tool | Best use | Main risk |
|---|---|---|
| Random-orbit sander | General leveling and finish sanding on solid panels | Swirl marks or local hollows if tilted or held still |
| Long sanding block | Hand sanding broad, flat areas and checking high spots | Slow removal; a short block can follow dips |
| Belt sander | Fast removal on rough, solid stock | Deep tracks and dish-outs from tipping or dwelling |
| Small detail sander | Corners and tight areas | Concentrated pressure and uneven removal on a broad panel |
A basic random-orbit sander is enough for occasional furniture or shelf work. For frequent use, a model with effective dust extraction is worth considering; dust between the pad and wood can create scratches. Compare 5-inch random-orbit sanders by pad size, dust collection, and whether replacement hook-and-loop pads are easy to find.
Prepare the surface before sanding
Scrape off dried glue and remove protruding fasteners first. Glue smears can resist stain and become more obvious after finishing, while sanding them aggressively can create a depression around the spot. Use a sharp scraper or chisel carefully, then sand the area evenly with the rest of the panel.
Check that the panel is supported on a stable, flat work surface. If it rocks, shim or clamp it before sanding. On a veneered panel, avoid coarse grits and heavy pressure; veneer thickness varies, and an edge or raised patch may be thin. If the surface only needs light finish preparation, starting around 150 or 180 grit is generally safer than starting at 60 or 80.
Sand in controlled passes
For rough solid wood with milling marks, begin at 80 or 100 grit only if the marks actually require it. Move to 120, then 150 or 180. For a panel that is already flat and smooth, start at 120 or 150. There is little benefit in using every grit in the sequence; the key is to remove the scratches from the previous grit before moving finer. Skipping from 80 directly to 180 often leaves coarse scratches that appear after stain.
Set the sander flat before switching it on and keep it flat until it stops. Move at roughly 1 inch per second, with overlapping passes by about half the pad width. Do not push down: let the machine and abrasive do the work. Keep moving beyond the panel edges rather than pausing at them, and avoid sanding only one small patch to chase a mark. If a defect needs more removal, widen the working area so the transition stays gradual.
Use fresh, clean abrasive. A worn disc cuts poorly, encouraging excess pressure and longer dwell time. Dust extraction helps keep grit cutting cleanly; a shop vacuum connected to a sander is often a reasonable lower-cost setup. For frequent sanding or fine dust-sensitive work, compare sander dust-collection accessories for compatibility with your tool.
Check flatness and scratches as you go
After each grit, vacuum the panel and wipe it with a clean cloth. Shine a bright light across the surface from a low angle to reveal ridges, swirls, and hollows. A pencil grid is a useful check: draw light lines over the panel and sand until they disappear evenly. If one patch clears much earlier than the rest, stop and check whether that area is high; do not keep sanding it automatically.
A straightedge can help distinguish a hollow from a color or grain change. Lay it across several directions and look for gaps. Do not try to correct a genuine low spot by sanding the entire panel unless enough thickness is available and uniform removal is acceptable. For thin veneer, a filled defect or a change in finishing approach may be safer than further sanding.
Finish sanding and edges
Before the final grit, remove all dust and inspect for leftover scratches. For many clear-coated surfaces, 150 or 180 grit is a useful stopping point; going much finer can reduce stain absorption and produce uneven color, depending on the wood and stain. Follow the finish maker’s instructions, and test the sanding schedule on scrap from the same panel when possible.
Hand-sand with the grain for the last pass, using a flat block and the same grit used on the face. Ease sharp edges with a light pass; edges sand faster than the panel face and are easy to round over or cut through. If you find a shallow dish, stop and reassess before continuing. A finish can emphasize a hollow, but more sanding is not always the right repair.
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