The Short Version
Clean → Inspect → Repair → Hone → Polish → Seal (if needed).
Use diamond abrasives in a grit ladder (e.g., 50 → 100 → 200 → 400 → 800 → 1500 → 3000), then optionally buff with a granite polishing compound.
Keep the surface flat, cool, and uniformly wet; advance only when the previous grit's scratches are fully removed.
Marble powders/crystallizers are not for granite. Use granite-rated compounds or diamond pads.
Safety First
Granite is hard, dense, and generates slurry or dust when abraded.
PPE: Safety glasses, hearing protection, cut-resistant gloves, N95/P100 if any dry work; knee pads for floors.
Wet work preferred: Minimizes silica dust and cools pads. Use GFCI outlets, manage runoff, and protect cabinets with plastic sheeting.
Secure support: For tops, brace overhangs; for steps, prevent edge chipping with edge guards or micro-bevels during finishing.
Tools & Materials (Pro Kit)
Variable-speed wet polisher (or planetary floor machine for large areas)
Diamond polishing pads (50–3000 grit; granite-rated, flexible for edges)
Backing pad & pad holder, splash guard, water feed or spray bottle
Granite polishing compound (e.g., tin-oxide blend) & black/white buff pad
Stone-safe cleaner, microfiber cloths, squeegee, painter's tape, plastic sheeting
Epoxy/UV resin for chip and pit fills; razor scraper for flush trimming
Impregnating sealer (granite-safe) for post-polish protection if absorption warrants
Prep: Set Up For Success
Deep clean. Degrease with a pH-neutral stone cleaner; remove waxes/silicone that can clog pads.
Inspect & mark. Circle chips, pits, scratches, lippage (tile edges not level), and dull zones.
Repair first. Fill chips/pits with clear or color-matched epoxy, slightly proud of the surface; cure and razor-flush.
Mask & protect. Tape seams, fixtures, and adjacent materials (wood, steel, paint).
Decide your finish target:
Polished: stop at 3000 grit, then buff/compound.
Honed (matte): stop at 400–800 grit.
Satin "leathered" feel: specialized brush heads-best done with pro gear.
Method A - Countertops & Edges (Wet Hand Polishing)
Speed guidance: follow your pad maker; as a rule, lower RPM for coarse grits (≈600–1200), moderate for mid grits (≈1200–2000), higher for fine/buff (≈1800–3000). Keep the pad moving-no dwelling.
50/100 Grit: Flatten & Remove Damage
Light, even pressure; keep a consistent pattern (overlapping passes).
Your goal is to remove scratches/chips, not to chase a mirror yet.
Rinse and squeegee to inspect between grits.
200/400 Grit: Uniform Scratch Pattern
Each grit must fully erase the previous pattern. If you still see deep lines after rinsing, you're not ready to advance.
On edges, maintain the arris (small eased edge) to minimize future chipping.
800/1500 Grit: Sheen Appears
The surface starts to reflect light evenly. Any shadowy bands indicate uneven dwell-go back a grit if necessary.
3000 Grit & Buff/Compound: High Gloss
Work in small sections; keep slurry thin (too much water dilutes compound).
With a black/white buff pad, apply a granite polishing compound; move slowly until the desired depth and clarity develop.
Do not use oxalic-acid marble powders or "crystallizers" (meant for calcite).
Final clean & dry buff. Remove residue, wipe with stone cleaner, and dry buff with microfiber for pop.
Method B - Floors & Large Areas (Planetary Machine)
Level first: If there's lippage, start with metal-bond diamonds (e.g., 30/50) to flatten; then switch to resin-bond pads.
Water control: Keep a thin, workable slurry; vacuum or squeegee between grits.
Systematic grid: Divide the floor into zones; log each zone's grit progression to avoid skipping steps.
Slip targets: For public/wet areas, you may stop at honed (400–800) or apply anti-slip treatment post-polish. Reserve high-gloss for dry interiors.
Method C - Spot Repairs (Scratches, Rings, "Dull Spots")
Feather a halo. Mask a soft rectangle around the defect. Start at the lowest grit that removes the damage (often 200–400) to minimize dish-outs.
Blend outward. Expand each successive grit slightly wider, finishing with the full panel area at the last two grits to avoid a "polished island."
Compound & inspect. If the spot still telegraphs under raking light, back up one grit and rework.
Finishing Choices & Where They Belong
Polished: Maximum color depth and reflectivity-kitchens, vanities, feature walls (dry areas).
Honed: Low-gloss modern look; hides fingerprints; better for floors that need lower reflectivity.
Textured (flamed, bush-hammered, sandblasted): Outdoor traction; not "polished" per se-achieved by thermal/mechanical texturing, then sometimes lightly brushed for feel.
Sealing After Polishing (Only If Needed)
Perform a water-drop test once the surface is clean and dry:
No darkening after 10–15 minutes: Skip sealing for now.
Slow darkening: Consider a light coat of impregnating sealer.
Fast darkening (<5 min): Apply one to two thin coats, keeping the surface wet during dwell and buffing off all residue before dry.
Common Mistakes (And Pro Fixes)
Advancing grits too soon → haze/banding.
Fix: Step back one grit, remove the pattern fully, rinse, re-inspect under raking light.
Overheating edges → resin "bleed" or swirl marks.
Fix: Lower RPM, increase water, lighten pressure, keep the pad moving.
Using marble powders/crystallizers on granite.
Fix: Strip residues, re-polish with granite abrasives; use tin-oxide or granite-rated compounds only.
Dishing at epoxy fills.
Fix: Let fills cure hard; razor-flush, then start at a slightly higher grit to avoid re-scooping.
Grit contamination (rogue scratches appear).
Fix: Rinse pads and surface thoroughly between grits; keep a clean staging area.
Troubleshooting Quick Table
| Symptom | Likely Cause | Remedy |
|---|---|---|
| Dull, milky look after 3000 | Residue or incomplete scratch removal | Deep clean; drop one grit; re-polish and buff |
| Swirl lines visible at angle | Too high RPM, dirty pad, uneven pressure | Clean pad, reduce RPM, cross-hatch passes |
| Edge chips after polishing | Sharp arris, vibration, poor support | Add micro-bevel; stabilize work; lighter passes |
| Gloss varies across tiles | Uneven lippage or grit skipping | Flatten first; repeat full sequence uniformly |
| Dark rings near sink | Absorbed oils, not etch | Degrease; poultice oil stain; repolish if needed |
Care After Polishing
Daily: pH-neutral stone cleaner; avoid high-alkali degreasers and acidic sprays.
Weekly: Dry buff with microfiber to maintain clarity.
Stains: Treat with poultices (baking soda + water for oils; hydrogen peroxide for organics).
Periodic check: Re-do the water-drop test annually; seal only when absorption returns.
FAQs
Can I dry-polish granite?
Small edge touch-ups are possible with dust control and PPE, but wet polishing yields better clarity, flatter geometry, and safer silica exposure levels.
What RPM is best?
Follow pad specs. As a heuristic: 600–1200 for coarse, 1200–2000 for mid, 1800–3000 for fine/buff. Avoid high-RPM burnishing that creates swirls.
Will polishing remove scratches?
Yes-if you start low enough to cut beneath the deepest scratch. Polishing alone won't erase damage; honing steps are mandatory.
Do I need a sealer after polishing?
Only if your granite absorbs. Test first; many dense stones don't need immediate sealing.
