Polishing Pads

Diamond Polishing Pads for Stone and Concrete

Polishing pads take a ground surface through to a finish, working up through progressive grits until the scratch pattern is fine enough to read as gloss. They are the standard method for countertop edges and cut-outs, vanity work, and polished-concrete floors. DOT stocks wet polishing pad sets covering the full grit range from coarse cutting through to final polish.

How Progressive Grits Work

The principle is simple and completely unforgiving. Each grit exists only to remove the scratch pattern left by the grit before it. A 50-grit pad leaves deep scratches; 100 removes those and leaves shallower ones; and so on up through 200, 400, 800, 1500 and 3000 until the remaining scratches are too fine for the eye to resolve and the surface reads as polished. Skip a step and the coarse scratches from two grits back are still there under the gloss at the end — they will show clearly in raking light, and the only remedy is to go back down and start again. Work each grit until the previous pattern is genuinely gone before moving up.

Wet Working

Wet polishing is the norm for good reasons. Water keeps the pad and the workpiece cool, which protects the resin bond in the pad and prevents burnishing or discolouring the stone. It flushes away the spent slurry so the pad cuts fresh material rather than grinding its own debris. And it controls dust entirely, which matters on stone containing silica such as granite and engineered quartz. Keep a steady feed of water on the surface and the pads clear; a pad clogged with dried slurry stops cutting and starts polishing prematurely, which gives a false sense of progress.

Stone Versus Concrete

Both take the same progressive-grit approach, but they behave differently. Granite, marble and engineered stone are dense and consistent, so the grit sequence proceeds predictably and a high gloss is achievable. Concrete is variable — it contains aggregate, sand and paste of different hardnesses in the same surface, so early grits may cut unevenly and you may expose aggregate as you go. Densifier is normally applied partway through a concrete polish to harden the paste and let the finer grits build gloss. Do not expect a concrete floor to behave like a slab of granite.

Pad Care and Storage

Rinse pads before the slurry dries on them and let them dry before stacking. Dried slurry hardens into the resin and blinds the diamond, which is the most common reason a pad set underperforms on its second job. Keep the set together and in grit order so nobody grabs the wrong one mid-sequence — a single out-of-order pad undoes the step before it.

Frequently Asked Questions

How do polishing pad grits work?

You step up through the grits in order, from coarse around 50 to fine around 3000. Each grit removes the scratch pattern left by the previous one, and the surface reads as polished once the remaining scratches are too fine to see.

Can I skip grits to save time?

No. Skipping leaves the coarser scratches in place under the gloss, and they show up clearly in raking light. The only fix is to go back down the sequence and work up again, which costs far more time than the step you skipped.

Should I polish wet or dry?

Wet, in nearly all cases. Water cools the pad and the surface, clears spent slurry so the pad keeps cutting, and controls silica dust from granite, quartz and concrete.

What grit should I start at?

It depends on the surface condition. A ground or previously polished surface may start around 200 or 400. A rough or freshly cut surface needs to start at 50 to 100 to establish flatness first.

Are the same pads used on stone and concrete?

The same progressive-grit method applies to both, though concrete is less consistent because of the aggregate and usually needs a densifier partway through to build gloss in the paste.

Why has my pad stopped cutting?

Usually clogging. Dried slurry blinds the diamond and the pad burnishes instead of cutting. Rinse pads before the slurry dries and keep a steady flow of water while working.

How long does a set of polishing pads last?

It depends on the material and how much stock each grit is removing, but the coarse pads always wear fastest because they do the heaviest work. Pads that are rinsed and dried properly last considerably longer than ones stacked wet.

Polishing stone or concrete? Tell us the material and the finish you are after — call our team at (701) 922-1526.