3 Ways to Smooth Glass Tips

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3 Ways to Smooth Glass Tips
3 Ways to Smooth Glass Tips

There are many do-it-yourself projects in which the glass becomes a staple, such as when creating candle holders or drinking cups. However, to reuse a bottle or other glass object, you need to smooth its broken, sharp edges. Fortunately, it's fairly easy to use sandpaper, a sanding drill, and an electric drill - or even powdered silicon carbide - to smooth the edges of a glass plate.


Method 1 of 3: Using Sandpaper

Smooth Glass Edges Step 1

Step 1. Wet an 80 grit sandpaper and place it on a flat surface

It is important that it is well wet and that the surface is hard and durable. To do this, immerse the sandpaper in a container of clean water and spray a little more on it after resting.

You can also use an emery board if you don't have access to wet sandpaper. It can be found in most construction houses or hardware stores

Smooth Glass Edges Step 2

Step 2. Place the edge of the cup on the sandpaper

Hold it with your dominant hand and keep the sandpaper steady with your other hand. Wear gloves and safety glasses for maximum safety.

  • You'll often find gloves and goggles at the same construction houses that also sell sandpaper.
  • If the glass has several sharp edges, hold it so that none of them is capable of hurting your hand. If that's impossible, it might be a good idea to smooth them out in another way.
Smooth Glass Edges Step 3

Step 3. Stir the glass in a circular motion for five minutes to smooth the edge

Apply light downward pressure to push it towards the sandpaper. Rotate it every two to three circles for a more even result.

  • If the cup is not rotated, you may end up sanding one side more than the others and getting a remarkably uneven result.
  • Try to run for five minutes or more for proper anti-aliasing.
Smooth Glass Edges Step 4

Step 4. Sand the inner and outer edges by hand

After sanding the "front" edge, take the sandpaper and dip it back into the water to moisten it. Then take the file with your dominant hand and place it over the edge, leaving your thumb and middle fingers on opposite sides. Finally, go back and forth to sand the sharp edge until it is very smooth.

Keep the sandpaper wet throughout the entire process. It may be necessary to continuously immerse it in water to get a proper result

Smooth Glass Edges Step 5

Step 5. Repeat this process with increasingly finer sandpaper

Advance with 150, 220, 320 and finally 400 grit sandpaper to make the glass even smoother. Finally, use 1000 and 2000 grit sandpaper to polish the edge perfectly.

Clean it with a damp cloth after sanding to remove any sandpaper residue or dust

Method 2 of 3: Sanding with an Electric Drill

Smooth Glass Edges Step 6

Step 1. Insert a sanding bit into the nozzle

For best results, opt for a medium grain finish (60 to 100) and a relatively large area. The larger it is, the more of the edge will be smoothed at once.

The drill must be the proper size for the piece of glass. If you're smoothing the edges of a halved wine bottle, for example, it should fit inside the interior space in order to sand the edges of the glass

Smooth Glass Edges Step 7

Step 2. Hold the tool with your dominant hand and the cup with the other

You can experiment with leaving the glass piece in a clamp to keep it secure, but this increases the likelihood of cracking around the edges. Still, you should only hold it with your hands if you can hold it securely without coming into contact with the drill.

  • Wear heavy-duty protective gloves when holding the glass piece.
  • If the object is too small to be handled safely, your best bet is to use a clamp to hold it or use an alternative method of smoothing the edges.


be careful when handling power tools. Wear gloves, eye protection and a ventilation mask.

Smooth Glass Edges Step 8

Step 3. Pass the sanding bit on the inner edges of the cup

Press the power button to turn the drill on and keep the side of the bit inside the rim of the cup. You don't need to apply any pressure, or the cup will break. Instead, just hold it by the edge to make it easier to move the process along.

  • Spend three to five minutes on this procedure to properly smooth the inside edge of the cup.
  • Remember to wear a ventilation mask during this step as this is a process that raises a lot of glass dust into the air.
Smooth Glass Edges Step 9

Step 4. Move the bit towards the top and outside edge of the cup

Advance towards the center and out towards the outer edge to smooth it out. Slowly rotate it until you have worked the edge completely.

This step should take no more than three to five minutes

Smooth Glass Edges Step 10

Step 5. Repeat this process with a fine-grain sandpaper to polish the edge

Replace the sanding bit with a finer grit. Then pass it over the edge of the cup again to smooth it out. Repeat this step as often as necessary, using finer grains until the polish is to your liking.

  • You can also just polish the edge by hand if you don't want to continue using the drill.
  • When finished, use a clean, damp cloth to remove any sandpaper residue or dust.

Method 3 of 3: Smoothing with Silicon Carbide

Smooth Glass Edges Step 11

Step 1. Place a floating glass plate over foam rubber in your workspace

It will be used as the "main" surface where the edge of the glass will be sanded. The foam will help keep it in place, preventing it from slipping through the process.

If you don't have a separate piece of floating glass for this, use another piece of glass nearby, such as a window, mirror, or frame

Smooth Glass Edges Step 12

Step 2. Add water and a relatively coarse grain of silicon carbide onto the glass

Pour some water into the center of the float glass to create a small puddle. Then pour in enough silicon carbide to cover this surface. Finally, use your fingers to gently blend them.

To facilitate the insertion of powdered silicon carbide, first place it in a disposable cup before pouring it into the glass

Smooth Glass Edges Step 13

Step 3. Place the sharp edge of the glass piece on the surface

Hold it with your dominant hand (or both, if necessary), remembering to position the edges directly over the location of the water-silicon carbide mixture.

For as much safety as possible, wear safety gloves to avoid cutting your hands with the glass

Smooth Glass Edges Step 14

Step 4. Circle your hand and bottle for 30 to 60 seconds

Move it along the figure-eight silicon carbide surface, applying some pressure as you move forward. Always work on the inside of the glass surface, avoiding going beyond the silicon carbide puddle.

Observe the edge of the glass piece after a minute of work. If it no longer shines and feels soft to the touch, you've done your job

Smooth Glass Edges Step 15

Step 5. Clean the glass piece with a towel and use sandpaper to smooth the inside

Use a moistened paper towel or dedicated towel to remove the water-silicon carbide mixture from it. Then use sandpaper as needed to smooth the inside edge of the glass piece.

  • If you're smoothing the edge of a cut bottle, for example, you won't be able to smooth the inside edges with just the silicon carbide water puddle.
  • You can also use sandpaper to smooth out any rough spots that this process has failed to work.

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