How do I choose the right diamond polishing pad for my stone?

Match three factors: (1) Stone hardness — soft stones (marble) need soft-bond resin pads, hard stones (granite, quartz) need medium to hard bond; (2) Pad size — 4 inch for general work, 2-3 inch for edges; (3) Grit range — start coarse (50-200) for grinding, finish fine (800-3000) for polishing. For most granite and marble work, a 4-inch wet resin pad set with 7 grits (50-3000) covers all stages.

What's the difference between 3-step and 7-step pad systems?

A 3-step system (50/400/3000 grit) is faster but skips intermediate grits, leaving micro-scratches that reduce gloss. A 7-step system (50→100→200→400→800→1500→3000) progressively refines the surface for maximum gloss. Use 3-step for production work or concrete; use 7-step for premium stone countertops where maximum depth and clarity matter.

Wet or dry diamond pads — which should I buy?

Wet pads are the professional standard for natural stone — they produce higher gloss, last longer, and eliminate silica dust. Dry pads work for quick touch-ups, outdoor work, or when water isn't practical. For shop fabrication, choose wet pads. For on-site repairs, keep a set of dry pads as backup.

What size diamond pads do I need?

4 inch (100mm) is the standard all-around size — fits most angle grinders and covers countertops, edges, and floors. 3 inch (80mm) is for tight edges and corners. 2 inch (50mm) is for detailed edge work and inside curves. 5 inch (125mm) is for production-speed large surface polishing. Start with a 4 inch set and add 2-3 inch pads as needed for edge work.

Product Selection Guide

Q: How many pads do I need for one countertop?

One 7-grit set (7 pads total) can polish approximately 50–80 sq ft of countertop edges. The coarser grits (50–200) wear faster because they do the cutting. You can expect 2–3 full countertop jobs (50 sq ft each) from one set before needing replacement, assuming proper wet use and reasonable pressure.

Q: Can I mix brands of diamond pads?

Yes, but not recommended within the same job. Different brands use different diamond concentrations and bond formulations — the 400 grit from Brand A may cut differently than the 800 grit from Brand B, creating an inconsistent scratch pattern. For best results, use one brand's full set through the entire grit sequence.

Q: Can I use the same pads on different colors of granite?

Yes, but be aware: dark resin pads can transfer dye onto light-colored stone. If you're switching from dark granite to white marble or Alaska white granite, either use undyed white resin pads or thoroughly clean your pads first. Dye transfer is cosmetic but visible.

How to choose the right diamond pads for your job — size, bond type, grit sequence, and stone matching in one place.

Factory-direct by KAIYI Diamond Pads Factory, Quanzhou, China

1. Quick Pick: Match Your Job to the Right Pad

Don't want to read the whole guide? Find your job below and go.

Your Job	Buy This	Link
Granite countertop edges & faces	4" Wet Resin Pads, 7-grit set (50–3000)	Shop →
Marble countertop / floor	4" Wet Resin Pads, start at 200 grit	Shop →
Polished concrete floor	Metal bond for grinding + 3-step resin for polish	Metal → + Resin →
Edge detail / tight corners	2" or 3" Wet Resin Pads	2" → 3" →
Quick touch-up / maintenance	4" 3-Step Wet & Dry Pads	Shop →
No water on site — dry polish only	3" & 4" Dry Diamond Pads	Shop →
Heavy grinding / lippage removal	4" Metal Bond Diamond Grinding Pads	Shop →
Small dry edge work / touch-up	2" Dry Diamond Pads	Shop →

2. Choosing the Right Pad Size

Size	Best For	Tool	Coverage
2" (50mm)	Inside corners, curved edges, narrow profiles, sink cutouts	Small angle grinder (4.5")	Precision work
3" (80mm)	Countertop edges, backsplash edges, corners	4.5" variable speed grinder	Edge-focused
4" (100mm)	🔥 THE STANDARD — countertop faces, edges, floors	4.5" or 5" variable speed grinder	Best all-around
5" (125mm)	Large flat surfaces, production speed	5" or 7" variable speed grinder	Production volume

Recommendation: If you only buy one size, get 4". It handles 90% of jobs.

3. Bond Type Explained

The bond must wear at the right rate to expose fresh diamonds. Too hard = glazing. Too soft = pads disintegrate.

Bond	Wear Rate	For These Stones	Product
Soft Resin	Wears quickly — constantly exposes fresh diamonds	Marble, limestone, travertine, onyx	4" Wet Pads →
Standard Resin	Balanced — good for 80% of jobs	Most granite, engineered quartz	4" Wet Pads →
Hard Resin	Wears slowly — resists quartz abrasion	High-quartz granite, quartzite	Contact us for hard bond
Metal Bond	Very slow — for grinding, not polishing	All stones + concrete: leveling, coating removal	4" Metal Bond →

Rule of Thumb: Hard stone → soft bond. Soft stone → even softer bond.

4. Grit Sequence Selection

Condition	Starting Grit	Sequence	Time (50 sq ft)
Heavy damage / lippage	50 grit	50→100→200→400→800→1500→3000	5–8 hrs
New fabrication / saw marks	50 or 100 grit	50→100→200→400→800→1500→3000	3–5 hrs
Light scratches / dull surface	200 grit	200→400→800→1500→3000	2–3 hrs
Maintenance / re-shine	400 or 800 grit	400→800→1500→3000	1–2 hrs

The Fingernail Test: If it catches → 50 grit. Textured → 200 grit. Smooth but dull → 400 grit.

5. Wet vs Dry: Which Type to Buy

Factor	Wet Pads ✅	Dry Pads ⚠
Gloss Quality	Highest — water cools and lubricates	Good, but rarely matches wet finish
Pad Life	80–150 linear ft on edges	40–70% of wet pad life
Dust Control	Slurry — contained mess	⚠ Silica dust — needs HEPA + respirator
Convenience	Needs water source	No water needed — good for on-site
Best For	Shop fabrication, indoor, premium work	On-site touch-ups, outdoor, quick fixes

If you can only buy one: Get wet pads. Add dry pads later for jobs where water isn't practical.

6. Stone-by-Stone Recommendations

Stone	Recommended Pad	Grit Start	Method
Granite (most)	4" Wet Resin, 7-grit (50–3000)	50 or 200	Wet
Granite (high quartz)	4" Wet, hard bond resin	50 or 200	Wet
Marble	4" Wet Resin, soft bond	200	Wet
Engineered Quartz	4" 3-Step Wet & Dry Pads	200	Wet only
Concrete	Metal Bond (grind) + 3-Step Resin (polish)	30	Wet/Dry
Porcelain Tile	4" Wet Resin, 5-grit (200–3000)	200	Wet

Full stone-specific guides: Granite | Marble | Concrete | Tile & Porcelain

7. 3-Step vs 7-Step Systems

	3-Step (50/400/3000)	7-Step (50→100→200→400→800→1500→3000)
Speed	Fast — 30–45 min per 50 sq ft	Thorough — 1.5–2.5 hrs per 50 sq ft
Gloss	78–85 GU (good, not great)	92–96 GU (showroom quality)
Callback Risk	Higher — skipped grits may show	Lower — progressive refinement
Best For	Concrete, production work, rental properties	🔥 Premium countertops, dark granite, high-end residential
Product	3-Step Wet & Dry →	7-Grit Wet Set →

Decision Rule: Premium customer → 7-step. Builder-grade job → 3-step is acceptable.

8. How to Spot Quality Diamond Pads

What to Look For	Good Sign	Red Flag
Diamond Concentration	Visible diamond pattern, consistent distribution	Sparse, uneven, or no visible diamonds
Backing Flexibility	Flexible rubber — conforms to the surface	Hard plastic backing — won't contour
Color Coding	Clear, consistent color per grit	No coding or color varies between batches
Velcro Quality	Strong hook-and-loop, survives 100+ changes	Velcro separates from pad after 20–30 uses
Wear Consistency	Entire pad face wears evenly	Edges wear faster than center (cheap resin)
Edge Delamination	Clean edge, diamond layer bonded edge-to-edge	Diamond layer peeling at edges after first use

All KAIYI pads use consistent diamond distribution, flexible rubber backers, and color-coded grit identification. Browse our full catalog →

9. FAQ — Product Selection Questions

I'm a beginner — what should I buy first?

Start with a 4" Wet Diamond Pad Set (7-grit, 50–3000), a variable speed angle grinder, and a backing pad. This handles granite, marble, and most countertop work. Add 2" or 3" pads when you start doing edge work. Add metal bond pads when you start doing heavy grinding or concrete.

How many pads do I need for one countertop?

One 7-grit set can polish approximately 50–80 sq ft of countertop edges. Expect 2–3 full countertop jobs from one set before needing replacement.

Can I mix brands of diamond pads?

Yes, but not recommended within the same job. For best results, use one brand's full set through the entire grit sequence.

How do I know when to replace a pad?

Replace when: (1) the pad stops cutting even after dressing, (2) the velcro backing shows through the resin, (3) the edge of the diamond layer delaminates, (4) the pad produces uneven results.

Do you sell individual replacement grits?

Yes. Since coarser grits (50, 100, 200) wear faster, you can purchase individual grits to replace worn pads without buying a whole new set.

Can I use the same pads on different colors of granite?

Yes, but dark resin pads can transfer dye onto light-colored stone. Use undyed white resin pads or thoroughly clean your pads first when switching to light stone.

Should I buy a 4.5" or 5" grinder for 4" pads?

Either works. The critical spec is variable speed — you need 2,000–4,500 RPM control. A fixed-speed grinder will destroy pads and burn stone instantly.

Application Guides: Granite | Marble | Concrete | Tile & Porcelain | All Products