When it comes to glass polishing, choosing the right diamond resin wheel grit can make or break your finish. Whether you are working on mirrors, tempered glass, or decorative panels, the wheel grit determines how smooth, shiny, and defect-free your final surface will be. So, what grit should you use — and when? Let’s walk through the details step by step.

1. Understanding Grit in Diamond Resin Wheels

The grit number of a diamond resin wheel refers to the size of its abrasive particles.

• Lower grit numbers (like 100#–200#) mean coarser particles, which remove material quickly.

• Higher grit numbers (like 800#–3000#) mean finer particles, which produce a smooth, polished surface.

In short, the smaller the grit number, the rougher the finish — and vice versa.

So yeah, grit size isn’t just a number; it’s the secret behind the shine.

2. Choosing the Right Grit for Each Polishing Stage

If you’re wondering how to pick the best grit combination, here’s a simple guideline for glass edge polishing or surface finishing:

1. Rough Grinding (100#–200# grit):
   Use coarse resin wheels to shape the glass and remove sharp edges or chips.

2. Fine Grinding (400#–800# grit):
   These medium grits smooth out the rough surface and start building clarity.

3. Pre-Polishing (1000#–2000# grit):
   This stage prepares the glass for the final shine. You’ll start to see the transparency improve.

4. Mirror Polishing (3000# grit or higher):
   Use high-grit diamond resin wheels for a glossy, mirror-like finish.

This sequence helps you move from rough shaping to fine polishing smoothly — skipping steps might save time, but it often leaves unwanted marks. Trust me, been there, done that.

3. Matching Grit to Glass Type and Thickness

Different glass types respond differently to grinding and polishing pressure. For example:

• Tempered glass needs moderate pressure and finer grits (like 1000#–2000#) to avoid stress cracks.

• Thick architectural glass can handle rougher grits (like 150#–400#) during the initial shaping stage.

• Decorative or coated glass should always use high-grit resin wheels to preserve the coating.

In other words, grit selection isn’t one-size-fits-all — it depends on what kind of glass you’re working on.

4. Common Mistakes When Choosing Grit

Even experienced operators sometimes pick the wrong grit combination.
Here are some quick don’ts:

• Using only one grit wheel for all stages — it’s a big no-no.

• Skipping water cooling — resin wheels can burn or glaze over without it.

• Over-polishing with coarse grit — this may create micro-cracks invisible to the naked eye.

And remember, if your diamond resin wheel feels “too slow,” it’s usually not the wheel’s fault — it’s the grit mismatch.

5. How to Extend the Life of Your Diamond Resin Wheel

Proper care helps your wheels last longer and perform better. Always:

• Dress your wheels regularly to keep the surface even.

• Store them away from heat and humidity.

• Avoid exceeding the recommended spindle speed.

High-quality wheels from a China resin wheel manufacturer can easily outlast cheaper alternatives if maintained well.

Selecting the right diamond resin wheel grit is essential for achieving high-quality glass polishing results. Start with coarse grit for shaping, move to medium for refining, and finish with fine grit for brilliance.