How to Fix a Hole in a Porcelain Sink: Repair Kit Vs Epoxy Putty

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Once a crack appears in a porcelain or ceramic sink, it will eventually develop into a hole, leaving the metal exposed and making it prone to rust. If you have got a hole in your porcelain sink, you may be wondering what the best way to fix it is. You have two main options: a repair kit or epoxy putty.

In this blog post, we will show you the difference between porcelain and ceramic sinks and how to fix a hole in a porcelain sink with a repair kit, and also using epoxy putty. We will also show you how to fix a broken sink with epoxy glue.

Difference Between A Porcelain And A Ceramic Sink

You can be forgiven if you didn’t know the difference between a porcelain sink and a ceramic sink because they are very similar in appearance. Essentially these two materials are produced using the same process, but one is more robust than the other.

Both porcelain and ceramic are forged in a kiln at very high temperatures. However, a more purified clay mixture is used for porcelain. additionally, the temperature is much higher than ceramic resulting in a denser and much more robust material.

A porcelain sink is generally either steel, or cast iron underneath that is coated with a thick layer of porcelain. A ceramic sink, on the other hand, is made out of a clay mixture that is molded into the required shape. Naturally, both sinks are very durable and do the job, but porcelain is less porous and more durable due to its steel or cast iron frame.

How To Fix A Hole In A Porcelain Sink Or Bathtub With A Porcelain Repair Kit

Tub Repair Kit White for Acrylic

If you have a cast iron or steel sink or bathtub with a porcelain overlay, then you will see a black mark when you chip the surface. These kinds of chips or holes are easily repaired using a porcelain repair kit.

Preparing The Surface

Before we can apply the compound from our repair kit, we will require the surface to be clean and dry. Sand the area that is damaged with fine sandpaper of 400 to 600 grit. Clean the dust with a cloth and then, using acetone wipe down the surface with a soft cloth and wait for the surface to completely dry before proceeding.

Prepare The Compound

It is important to note that the fumes these compounds expel are very dangerous, so make sure to work in a well-ventilated space and wear goggles to protect your eyes throughout the entire process.

Most repair kits will have detailed instructions which you will need to follow. Most compounds need to be mixed on a clean, smooth surface to avoid any possibility of contamination. To achieve this, use a clean ceramic tile for the mixing process.

The porcelain repair kit will not work properly if it is contaminated while mixing the compound together. To avoid this, use a clean ceramic tile.

Use something that has a clean, sharp edge to apply the compound, giving you a smooth surface. Wait for it to dry, and apply more layers until the hole is entirely covered.

Use fine sandpaper, around 400-600 grit, to sand the surface to a smooth finish.

Use acetone or soap and water to clean the surface of any dust particles and leave it to dry.

Prepare For Paint

Generally, porcelain repair kits are available in a gloss or matt as well as a range of different colors, so make sure to match the correct color and finish to your current sink or bathtub. This will allow you to cover small cracks without having to paint.

For larger cracks, use a small soft brush to paint the enamel surface that you have repaired and leave it to dry for at least 12 hours before using the sink or bathtub.

How To Fix A Chipped Porcelain Sink Using Epoxy Putty

Gorilla All Purpose Epoxy Putty Stick, 2 Ounce, Grey, (Pack of 1)

Replacing your sink can be quite costly, so if you have chipped your sink basin or bathtub, there is no need to replace it just yet. Utilizing epoxy putty, we will eliminate these chips with relative ease.

Preparing The Surface

Sand the chipped area and a small surrounding area of the sink or bathtub with fine sandpaper of 400-600 grit, and clean the surface of any dust with soapy water or acetone if you have any. Leave to dry, or use a hair dryer to speed up the process.

Apply The Putty

Ensure that the surface is thoroughly cleaned; otherwise, the putty will not be able to stick to the surface. After cutting off the required amount of putty, knead it for a couple of minutes.

With a putty knife, apply the putty over the chipped areas covering the holes until they are properly filled. To ensure the surface is smooth, run the putty knife over the surface with a little soapy water. Leave the putty to cure for an hour.

Sand the putty down to a smooth plane and clean it with acetone or soapy water. Allow 30 minutes to dry.

Paint The Surface

The surface is smooth and clean, and it is dry. We are now ready for the painting part of the job.

Make sure you have the correct color and texture of the paint before applying any paint. If you are unsure, paint a small area on the sink or bathtub and be ready with a cloth dipped in acetone to wipe it off.

Apply the paint to the treated areas with a soft brush and allow 6-12 hours to dry.

How To Fix A Broken Ceramic Sink With Epoxy Adhesive

3M Scotch-Weld Epoxy Adhesive DP100 Plus, Clear, Professional Grade

Replacing your sink can be quite costly, but if you have broken a piece off and you still have it, there is no need to replace the sink just yet. We will look at how to repair this apparently unrepairable sink. You will need epoxy adhesive and a little bit of patience to get the great results you are after.

Preparing The Surface

Sand the area where the piece broke off on the ceramic sink and wiped any dust with soapy water or acetone. Wait for the area to dry so that the adhesive can do its job completely.

Apply The Adhesive

Ensure the surface of the broken piece of ceramic that you will attach is free of any dust or debris. Sand it lightly with fine 400-600 grit sandpaper and clean with acetone or soapy water.

Apply the adhesive on both the broken piece of ceramic and the sink and hold the broken-off piece in place for approximately 10 minutes. Allow 60 minutes for the adhesive to dry.

Fix The Rough Edges

Most adhesives are clear, so once you have applied the adhesive and stuck the piece back on, you are done; however, occasionally, you may be left with a rough edge that needs attention. Fill the area with putty and paint over it for that smooth finish.

If you do need to perform this part of the process, then read the article above (How To Fix A Chipped Porcelain Sink Using Epoxy Putty) for a more detailed description.

How to Resurface A Ceramic Sink

If your sink or bathtub is looking tired, faded, and lost its shine, leaving you thinking that it may be time to replace it, then we are here to tell you that you can quite easily turn back the years and bring that shiny look back by refinishing the sink or bathtub.

Ensure the area is well-ventilated and you have all the protective gear, including a breathing mask to prevent inhaling harmful fumes and protective gloves. This method requires patience so try not to hurry the process.


  • Thoroughly clean the sink or bathtub. Washing it with soapy water and using a brillo pad. Naturally, there is no need to worry about scratching the surface as we will paint it.
  • Sand the entire surface with 100-200 grit sandpaper ensuring that you are leaving a rough surface to allow the paint to stick
  • Vacuum the area of any dust and clean the surface with a cloth dipped in acetone.
  • Tape up any areas that you don’t want the paint on and put a thin primer layer on and leave to dry for an hour before allowing more thin primer layers. It is important to remember that several thin layers are much better than 2 or 3 thick layers. This will ensure that the paint doesn’t peel in the future and wait for 3-4 hours.
  • You should apply the epoxy paint that is specifically for sinks and bathtubs only. Again thin layers of spray paint and wait 1 hour between coats. It depends on your sink or bathtub, but we recommend around 7-8 coats. Wait for at least a day before completing the final process.
  • It’s time to apply that shiny glossy finish to your sink or bathtub by spraying a polyurethane coat on top. Apply 3-4 layers again using the less is more method. Wait 24 hours before using.

How to Protect Porcelain Or Ceramic Sink from Scratching While Drilling

You need to install a small chain or want to install a filter water tab on the side of your kitchen sink and need to drill a hole in the ceramic sink. It is very easy for your drill to slip while drilling and leave a scratch in the sink. We will show you the best way to safely drill a hole in your sink without scratching or damaging it.

  • Stick masking tape on both sides of the sink where you need to drill the hole.
  • Mark the position of the hole on the masking tape.
  • Before drilling, wear eye protection goggles.
  • Start to drill slowly and then increase the speed and pressure gradually to avoid any slips.
  • Wait for the surface to cool down before you touch the tape.
  • Remove the tape and lightly sand around the hole.

FAQ’s Frequently Asked Questions

How do I know if my bathroom sink is porcelain or ceramic?

It is actually very difficult to tell these two materials apart. The manufacturing process is almost identical, apart from the fact that porcelain is fired at higher temperatures. Porcelain sinks and bathtubs have a cast iron or steel base with a coat of porcelain, so holding a magnet against the surface should reveal whether you have porcelain or ceramic.

Can you pour boiling water into a ceramic or porcelain sink?

These materials are forged at extremely high temperatures, so pouring boiling hot water will not damage them in any way.

Why do my sinks smell like sewer?

This sewer smell is coming from your drain because the P-trap that sits under your sink has either dried up or doesn’t have enough water in it to create that seal that stops the smell from coming back up the drain.

What can you pour down a smelly sink or bathtub?

Put one cup or 100 grams of baking soda into the drain, followed by 100ml of hot vinegar and let the mixture fizz up and leave it for around 30-40 minutes. Boil a kettle and pour the hot water down the drain. If the smell persists, repeat the process. Ensure to have windows open and the ventilation fan on.

How long does a reglazed sink last?

If the sink or bathtub has been reglazed correctly, by which we mean it was properly sanded and has several coats of primer as well as several coats of epoxy paint, then it should last 15-20 years and, in some cases, if maintained properly, even longer.

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