What speed grinder to polish granite

For granite polishing, always use a variable-speed grinder/polisher and stay within the low-to-mid speed range:

Recommended speed window: 900 – 1,500 RPM for the main wet-grinding/polishing steps (grits 50 → 3000).

Absolute ceiling: never exceed 2,800 RPM; even that upper limit is reserved only for light, final buffing with 3000-grit or a felt buff pad.

Best practice: start each new grit at the lowest speed (~900 RPM), then raise slightly only if the pad is cutting too slowly; rarely is more than 1,500 RPM needed.

Using water throughout (wet polishing) and keeping the tool in this rpm range prevents burning the resin bond, avoids swirl marks, and gives the deepest gloss on granite edges or tops.

No natural stone is hard enough to "cut" granite; instead, industry relies on synthetic diamond grit.

In the past, loose quartz sand or garnet was used as a grinding aid, but it only abrades-never produces the mirror gloss.
To actually polish granite you need:

Diamond-impregnated resin pads (grits 50 → 3000) for the cutting/smoothing steps, followed by a felt pad and a micronized diamond "buffing compound" to bring the glassy shine .

Commercial granite creams/powders (e.g., Dia-Glo, Faber Star Shine) that contain micro-diamond or aluminum-oxide and are designed for final burnishing.

So, strictly speaking, no natural stone will polish granite; diamond abrasives are required.

Daily cleaning: wipe the counter with a soft microfiber cloth and a few drops of neutral stone cleaner (or a mix of a teaspoon of mild dish soap in a quart of warm water). Rinse with plain water and dry immediately so no film remains.

Deep cleaning (if it looks dull or greasy): spray a pH-neutral stone degreaser, let it sit five minutes, agitate with a non-scratch sponge, rinse, and dry.

Disinfecting: mist 70 % isopropyl alcohol, let it dwell for three minutes, then wipe dry; this kills germs without etching the surface.

Stain removal: make a poultice-mix baking soda with a little water to form a thick paste, spread it ¼-inch thick over the spot, cover with plastic wrap, poke a few holes, and leave 24 h. When the paste is completely dry, lift it off, rinse, and wipe dry. Repeat once if a faint shadow remains.

Polishing: after the stone is perfectly clean and still slightly damp, run a variable-speed wet polisher at 900–1 500 rpm through diamond resin pads in sequence 200-400-800-1500-3000 grit, keeping the surface wet. Follow the 3000-grit pass with a felt buff pad and a dime-sized drop of granite polishing cream (micro-diamond or aluminum-oxide compound); buff at low speed until the surface turns glassy. Wipe off residue with a dry microfiber cloth.

Protection: finish by applying a breathable granite sealer-spray on, let it penetrate five minutes, buff dry with a fresh cloth, and allow a full 24 h cure before placing objects back on the counter.

Use two separate products-one for sealing and one for polishing-after the granite has been cleaned and is completely dry.

Sealing
Apply an impregnating nano-sealer such as STAIN-PROOF Permanent DIY Granite Sealer. Flood the surface, let it soak for the time stated on the bottle (usually 5-10 min), add more if it soaks in completely, then buff every trace of excess off with a clean micro-fiber cloth; no second coat is normally required for everyday kitchen use.

Polishing
For the final gloss, work a granite-specific polishing compound into the stone with a felt pad or micro-fiber bonnet at low speed (900-1 500 rpm). Professional choices are Dia-Glo for dark granites or Tenax granite polishing powder for light ones; both are aluminum-oxide blends that bring the

surface to a mirror finish after the last 3000-grit diamond pad pass . Buff off any residue and the counter is sealed, polished and ready for normal use.

When using MB20 Granite Polishing Cream, the best type of polishing pad to use is a white glomesh pad. This pad is suitable for most repolishing jobs and works well with the MB20 cream to achieve a smooth and shiny finish.

Steps to Use MB20 with a White Glomesh Pad

1.Preparation:

Clear the granite surface of any items.

Clean the surface thoroughly with a pH-neutral cleaner like MB Stonecare MB5 Stone & More to remove any dirt or grime.

Place protective coverings on surrounding areas to prevent damage from splashing or spillage.

2.Apply Polishing Compound:

Apply a teaspoon of MB20 polishing cream and a tablespoon of water to a half square meter area at a time.

3.Buff the Surface:

Use a variable speed orbital polisher with the white glomesh pad to buff the surface in circular motions.

Start at a low speed and gradually increase the speed as the compound dries.

4.Final Touches:

Inspect the polished area and repeat the process if necessary to achieve the desired shine.

Thoroughly clean the surface with a damp cloth to remove any remaining polishing compound.

Consider applying a high-quality granite sealer to protect the polished surface from stains and spills.

By following these steps, you can effectively polish and restore the shine to your granite surfaces using MB20 and a white glomesh pad.

To polish granite you need three things: a variable-speed wet polisher, a full set of diamond pads, and a granite-specific polishing compound.

Start with a 4-inch or 5-inch variable-speed angle grinder or wet polisher that can run between 1,200 and 1,800 rpm. Fit it with hook-and-loop diamond polishing pads in this grit sequence: 400, 800, 1500, 3000. Keep the surface wet while you work-either with a spray bottle or a continuous water feed-so the pad doesn't burn the stone and the slurry is washed away.

After the 3000-grit pad has left the surface uniformly smooth and semi-gloss, switch to a soft white felt or glomesh pad and apply a granite polishing cream such as MB-20 or Tenax Granite Polish. Buff at low speed (around 1,000–1,400 rpm) until the gloss matches the factory finish, then wipe off the residue with a damp micro-fiber cloth. If you want extra protection, let the stone dry overnight and apply a solvent-based granite sealer the next day.

When you polish granite, run a variable-speed wet polisher at about 1,200 to 1,800 rpm. Start at the low end (around 1,200 rpm) with coarse pads so you don't overheat or gouge the stone. As you move to finer grits-400, 800, 1500, 3000-gradually raise the speed toward 1,600–1,800 rpm. Keep the surface wet, use light, even pressure, and let the pad do the work; pressing harder will only slow the motor and leave swirl marks. If you are buffing a cream like MB-20, drop back to roughly 1,000–1,400 rpm with a soft white pad so the compound has time to break down and create an even gloss.

First determine how deep the scratch is. If you can feel it with a fingernail, it is too deep for a simple polish and must be ground out; if you can't feel it, you can usually polish it away.

For a shallow, fingernail-invisible scratch:

1.Clean the area with a pH-neutral stone cleaner and let it dry.

2.Mask the surrounding surface with painter's tape to protect it.

3.Wet the area with a spray bottle; always keep it wet while you work.

4.Using a variable-speed wet polisher or a small angle grinder set to about 1,200–1,400 rpm, place a 400-grit diamond polishing pad on a flexible backer and make two or three light passes over the scratch, keeping the pad flat and moving in a small circular pattern.

5.Rinse and inspect; if the scratch is gone, proceed to the next grit. If it is still visible, repeat with 400 grit until it disappears.

6.Once the scratch is gone, step up through 800, 1500, and 3000 grit pads, raising the speed gradually to 1,600–1,800 rpm and spending enough time at each grit to remove the haze left by the previous one.

7.Rinse again, then apply a teaspoon of MB-20 polishing cream (or Tenax powder mixed with water) to the spot. Buff with a soft white felt or glomesh pad at low speed (1,000–1,400 rpm) until the gloss matches the rest of the slab.

8.Wipe off residue with a damp microfiber cloth, dry the area, and seal the stone if desired.

For a deep scratch that catches your fingernail: Begin with a 200-grit metal-bond diamond pad instead of 400 grit, follow the same wet, low-speed sequence, and spend more time at each coarse grit until the surrounding surface is level with the bottom of the scratch; then continue through the normal progression to 3000 grit and finish with the polishing compound as above.

Work patiently, keep the surface wet, and check your progress frequently; rushing or skipping grits will leave a hazy patch that stands out more than the original scratch.

For a granite floor you need three things: a machine that can keep the pad flat, the right diamond sequence, and a compound that will bring up the final glassy layer.

Start with a 17-inch low-speed floor buffer (150–200 rpm) or a variable-speed hand polisher if the area is small. Fit it with a Velcro drive plate and flexible diamond pads: 400-grit to level any traffic scuffs, then 800, 1500 and 3000 grits. Work wet-mist the floor with a hose or use the built-in water feed so the pad never spins dry; heat will glaze the quartz and leave a cloudy patch. Overlap each pass by half the pad width, and rinse the slurry away before you move to the next grit; any leftover grit will act like sandpaper and put new scratches back in.

When the 3000-grit pad has left the surface uniformly satin, switch the machine to a soft white polishing pad and apply a granite-specific crystallising spray or powder such as Revontulet HP or Tenax Granite Polish. Spread it at roughly 5 ml per square metre, buff at the same 150–200 rpm until the liquid dries to a clear film, then pick up the residue with a micro-fibre mop. One pass is usually enough, but you can repeat the crystallising step for extra depth. Finish by damp-mopping the floor to remove any loose powder and, if you want longer-term protection, apply a solvent-based granite sealer 24 hours later.

Keep the pad flat, keep it wet, and let each grit finish the job before you jump to the next; that sequence will take a dull, scratched granite floor back to a mirror finish you can read newsprint in .