How not to skip grits

Do not skip sandpaper grits simply to finish faster. Each grit should remove the scratches left by the previous one. If you jump too far, the finer paper may polish the surface without removing the deeper scratches underneath. The result can look smooth while still showing visible lines after stain, paint, or clear finish is applied.

You can sometimes skip one grit when the surface is already fairly even, but large jumps are risky on bare wood, old finishes, and visible flat surfaces.

What “skipping grits” means

Sandpaper grit describes the size and spacing of the abrasive particles. Lower numbers are coarser and remove material faster. Higher numbers cut more slowly and leave a finer scratch pattern.

A typical progression might look like:

• Coarse: about 40–80 grit for heavy defects, uneven edges, or finish removal
• Medium: about 100–150 grit for leveling and removing coarse scratches
• Fine: about 180–220 grit for final preparation before many paints and finishes
• Very fine: higher grits for between-coat sanding or specialized finishing work

These ranges are general, not universal rules. Follow the coating, wood, tool, and abrasive manufacturer's recommendations when they differ.

Why large grit jumps cause problems

A coarse abrasive creates deep grooves. A finer abrasive must cut down the sides and bottoms of those grooves before it can create its own consistent scratch pattern. If the jump is too large, the finer paper may remove the high spots but leave the valleys behind.

Those remaining scratches can become more visible when you:

• Apply stain or dye
• Wet the surface with finish
• Use a glossy clear coat
• Apply paint with a thin or low-build coating
• Sand across contrasting wood grain

The surface may feel smooth to your hand because fingertips do not always detect narrow scratches. Use angled light and inspect the entire surface before moving on.

A practical grit progression

The right sequence depends on how rough the starting surface is.

Removing a rough finish or severe defects

For thick paint, heavy oxidation, glue buildup, or major unevenness, begin with a coarse grit only if necessary. Then move through a sequence such as:

60 or 80 → 100 or 120 → 150 → 180 or 220

Do not begin this aggressively on thin veneer, soft edges, or surfaces where removing material could change the shape. A scraper, chemical stripper, or less aggressive abrasive may be safer depending on the finish and manufacturer's instructions.

Smoothing already-planed or lightly marked wood

If the wood is mostly flat and has only light tool marks, starting around 120 or 150 may be appropriate. A progression such as:

120 → 150 → 180 → 220

usually gives each abrasive enough opportunity to replace the earlier scratch pattern without unnecessary material removal.

Sanding between coats

Between coats of finish or paint, the goal is usually to remove dust nibs and provide a suitable surface for the next coat—not to reshape the workpiece. Use a fine abrasive recommended for that coating, apply light pressure, and avoid sanding through corners or edges.

A coarse starting grit is generally unnecessary for this job.

How much can you safely skip?

There is no single grit-jump rule for every material, but these guidelines help:

• Stay closer together after coarse sanding. Deep scratches take more work to remove.
• A single-step jump is usually safer than a large jump. For example, moving from 120 to 150 or 180 is more predictable than moving directly from 80 to 220.
• You may skip a grit when the surface is already uniform. If the preceding abrasive has removed all defects and its scratch pattern is consistent, the next suitable grit may be enough.
• Do not skip based only on feel. Inspect under strong, angled light.
• Be more conservative before stain or clear finish. Transparent coatings reveal inconsistent scratch patterns more readily than many opaque paints.

The important question is not whether you used every available grit. It is whether the current grit has removed the scratches and defects from the previous one.

Use a sanding test area

Before sanding an entire panel, try your planned progression in an inconspicuous area or on a scrap piece of the same material.

1. Sand a small area with the first grit.
2. Remove dust with a vacuum or a clean, dry method appropriate for the material.
3. Inspect with angled light.
4. Sand with the next grit in a different direction or pattern.
5. Check that the earlier scratch direction has disappeared before advancing.

Changing direction slightly between grits can make leftover scratches easier to see. Before the final grit, return to the grain direction when sanding wood unless the product instructions say otherwise.

Adjust the sequence for the material

Bare wood

Sand with the grain for the final passes. Pay special attention to end grain, soft wood, and edges because they can absorb stain differently or become rounded from excessive sanding.

Do not assume a higher grit is always better. Some stains and finishes need enough surface texture to absorb or adhere properly. Follow the coating manufacturer's preparation guidance.

Painted surfaces

When removing paint, the abrasive must cut through the coating without creating unnecessary grooves in the substrate. If lead paint may be present in an older building, stop and follow applicable lead-safe procedures rather than dry-sanding casually.

For repainting, a light scuff with an appropriate fine abrasive may be enough if the old coating is sound. Peeling, loose, or incompatible coating requires more preparation than simply changing grits.

Veneer and thin surfaces

Use light pressure and avoid aggressive coarse grits unless the material manufacturer specifically permits them. Veneer can sand through quickly, especially at edges and corners. A sanding block can help keep pressure even, but do not force it into delicate areas.

Between coats of finish

Use a fine abrasive or sanding product intended for between-coat work. Sand only until the surface is uniformly dull or the defects are removed. If you cut through to bare wood, clean the area and follow the finish manufacturer's repair instructions before recoating.

Signs that you skipped too far

Stop and step back to a coarser grit if you notice:

• Long scratches that remain after several passes with the current grit
• Scratch marks running in a different direction from the rest of the surface
• Shiny low spots surrounded by dull sanding marks
• Coarse scratches that become obvious after applying finish
• Edges or corners that are being removed before the flat area is smooth

Going back one grit is usually faster than continuing with a fine abrasive that cannot reach the deeper scratches. Sand until the surface has a consistent pattern, then advance again.

Avoid creating new problems while progressing

Use light, even pressure. Excessive force can clog the abrasive, create uneven low spots, and cause premature wear. Replace or clean the abrasive when it stops cutting effectively; worn paper can burnish the surface instead of sanding it.

Keep dust from contaminating later steps. Vacuuming is generally preferable to blowing dust into the air, and use appropriate respiratory and eye protection for the material and finish involved. Follow the tool and abrasive safety instructions.

Use a sanding block or properly sized backing pad when the job calls for a flat surface. A bare sheet held in your fingers can concentrate pressure and produce waves or finger-shaped depressions.

When replacing the abrasive is the right move

If the paper is clogged, torn, glazed, or no longer cuts with light pressure, change it rather than pressing harder. Use the correct format—sheet, disc, sponge, or other abrasive—for the tool and surface.

If a surface still shows deep scratches after a sensible progression, the issue may be uneven material removal rather than the final grit. Return to the grit that can level the area, then work forward again. If the substrate is damaged, the coating is failing, or the surface is veneer, replacing material or seeking professional advice may be more appropriate than continuing to sand.