The appearance of a crack on the inner wall of the refrigerator compartment is a signal that cannot be ignored. The plastic from which the inner casing is made is not only a decorative element, but also an important part of the thermal insulation and tightness of the system. Violation of integrity the surface leads to moisture entering the thermal insulation layer, which causes swelling of the walls and corrosion of the metal.
In addition, in In microscopic gaps, bacteria and mold begin to actively multiply, the waste products of which are difficult to remove with ordinary washing. The smell of rot can become a constant companion, and food will begin to spoil faster. That is why the question of how to repair a crack inside a refrigerator becomes relevant immediately after a defect is discovered.
In this article we will analyze proven methods for restoring plastic, select safe materials and consider a step-by-step algorithm of actions. You will learn which adhesives will not harm stored products, and how to extend the life of your unit without calling a technician.
Why cracks appear on the walls of the refrigerator
Plastic used in modern refrigerators (most often ABS plastic or polystyrene), quite durable, but fragile at low temperatures. The most common cause of defects is mechanical impact. Careless movement of heavy pots, falling glass bottles or an elbow can lead to the formation of a chip, which over time will turn into a fracture.
Another common cause is temperature deformation. If you defrosted the camera using sharp objects (a knife or screwdriver) or used a hair dryer, the plastic may not withstand the sudden temperature change. Thermal shock causes stress in the structure of the material, and it bursts. Cracks can also be caused by manufacturing defects or natural aging of plastic, which loses elasticity over time.
⚠️ Attention: If a crack appears in the evaporator area (where the freon tubes are visible) or is accompanied by hissing, immediately unplug the device. In this case, independent repairs are prohibited due to the risk of refrigerant leakage.
Sometimes the cause is improper installation of the unit. If the refrigerator is not level, the door may close askew, creating constant pressure on one of the inner walls. Over time, this leads to material fatigue and the appearance of cracks in the corners or at the shelf fastenings.
The choice of a safe material for repair
The choice of what to seal the crack with directly depends on safety requirements. Food is stored inside the refrigerator, so the material used must be non-toxic once dried and resistant to low temperatures. Regular construction adhesive will not work here, as it may contain harmful volatile substances.
One of the best options is food-grade epoxy resin. It creates a durable, waterproof coating that is not afraid of moisture and cold. It is important to choose formulations labeled “food contact” or those intended for container repair. After complete polymerization, such glue becomes inert and safe.
Another popular option is specialized adhesives for plastic, such as Cosmofen (cyanoacrylate) or two-component acrylic-based compounds. They set quickly and adhere well to smooth surfaces. However, cyanoacrylates can be brittle in extreme cold, so they are best used for small cracks that are not subject to stress.
Silicone sealants also are used for repairs, but they must be neutral (not acidic). When dry, acid sealants emit acetic acid, which can damage the metal parts inside the chamber and leave a persistent odor. Neutral sanitary silicone elastic and seals joints well.
Surface preparation before applying glue
The quality of repairs depends 80% on surface preparation. The plastic of the refrigerator is often covered with a grease film and condensation, which reduce the adhesion of the adhesive. The first step is to completely defrost the chamber. Leave the refrigerator turned off for at least 24 hours so that it is completely dry.
Then you need to degrease the area around the crack. To do this, use alcohol, acetone or a special degreaser. Wipe the surface thoroughly, removing all dirt. If this is not done, the glue will lie on top of the dirt and (quickly) peel off, while moisture will continue to penetrate inside.
For better adhesion, the edges of the crack can be lightly sanded with fine sandpaper. This will create micro scratches for the glue to grab onto. The main thing is not to overdo it and not damage the underlying layer of thermal insulation if the crack is deep.
☑️ Preparation for repair
If the crack is long and tends to diverge, it is recommended to drill holes at the ends of the crack with a thin drill (1-1.5 mm). This will stop further propagation of the crack due to thermal expansion of the plastic. This procedure is called drilling the ends and is a standard practice in plastic repair.
Epoxy resin repair technology
Epoxy resin is a universal solution for sealing through and deep cracks. It is sold in the form of two components: a base and a hardener. They must be mixed strictly according to the instructions, usually in a ratio of 10:1 or 1:1, in a clean container.
Apply the finished mixture with a spatula or spatula, pushing it firmly into the crack. It is important that the resin fills the entire volume of the defect. If the crack is through, you need to install a patch on the back side (outside the refrigerator, if possible, or after gluing it with tape) so that the resin does not leak out.
| Parameter | Value / Description | Influence on the result |
|---|---|---|
| Life time of the mixture | 5-30 minutes | Time during which you need to apply the glue |
| Initial setting time | 2-4 hours | Period when repairs cannot be touched |
| Full polymerization | 24 hours | Time before turning on the refrigerator |
| Temperature conditions | from -40°C to +80°C | Working range after drying |
After application, level the surface with a spatula, trying to make the layer as even as possible. Excess can be removed immediately while the resin is liquid. Once dry, the epoxy can be sanded, making the repair almost invisible.
⚠️ Attention: Work with epoxy resin in a well-ventilated area and use gloves. Hardener vapors can be toxic until complete polymerization.
What to do if the epoxy has flowed?
If the resin begins to flow down the wall, do not try to wipe it with a rag - you will only smear the sticky layer. Wait until it thickens slightly (looks like jelly) and carefully scrape off the excess with a blade or plastic card.
Using special adhesives for plastic
If the crack is superficial and not through, you can use liquid adhesives for plastic, for example Cosmofen Plus or analogues. The peculiarity of these compositions is that they slightly melt the surface of the plastic, soldering the edges of the crack at the molecular level. This ensures high seam strength.
The application technique is simple: apply glue with a thin needle or the tip of a tube along the crack. Under the action of the capillary effect, the glue itself will flow deep into the surface. Press the edges of the crack tightly together and hold for 30-60 seconds. Complete hardening takes several hours.
The advantage of this method is speed and no need to mix components. However, cyanoacrylate-based adhesives have a disadvantage: they are afraid of moisture at the time of application (although the inside of the refrigerator is dry, condensation can interfere) and can turn white when dry, leaving a noticeable mark.
To enhance the effect, you can use the “glue + soda” method. Sprinkle some baking soda into the crack and add glue on top. The reaction will cause instant hardening, forming a strong composite. This method is good for repairing broken corners or edges.
Repair using soldering and plastic solder
For large cracks or breaks where the edges separate, soldering is the most reliable method. You will need a soldering iron with a thin tip and a piece of plastic identical to the case material (can be cut from an inconspicuous place inside, for example, under vegetable boxes).
Heat the soldering iron tip and carefully move it along the crack, fusing the edges. At the same time, add the prepared plastic solder, filling the recess. The melted plastic will fill all the voids and, after cooling, will become one with the wall.
This method requires skill and caution so as not to burn through the wall and damage the thermal insulation. Melting point ABS plastic is about 100-110°C, so a powerful hair dryer or too hot soldering iron can deform large area.
After cooling, the seam will be rough. It must be sanded with fine sandpaper dipped in water to achieve a smooth finish. If the color of the seam is different, you can use special markers for plastic or paint, but it is better to leave the inside of the refrigerator as is, as long as there are no sharp edges.
The final stage and checking the tightness
After the repair work is completed and the materials have dried, do not rush to load the products. First you need to check the quality of the seam. Visually inspect the repaired area: there should be no bubbles, peeling or unfilled areas.
Perform a leak test if the crack was through. You can apply a soap solution to the seam (from the outside, if there is access, or carefully inside, watching the foam) and see if bubbles appear with light pressure. However, in a home camera environment, the best test is time.
Turn on the refrigerator and leave it running empty for several hours. Check to see if there is any foreign odor. If the smell of glue or chemicals persists, it means that the material was chosen incorrectly or did not have time to fully polymerize. In this case, it is better to suspend operation.
Can regular superglue be used?
Regular superglue (cyanoacrylate) can be used, but with caution. It is toxic until it dries out and is fragile in the cold. For in-chamber repairs, it is better to choose special compounds with a safety mark or food-grade epoxy.
Do you need to remove the door for repairs?
It is not necessary to remove the door, but it is advisable to provide good access to the crack site. If the crack is located near a hinge or in a hard-to-reach corner, dismantling the door will make the work easier and will allow you to better degrease the surface.
How long does the glue dry inside the refrigerator?
Drying time depends on the type of glue and temperature. In a cold room, the polymerization process may slow down. It is recommended to keep the refrigerator turned off with the door open for at least 24 hours to completely remove odors.
What to do if a crack comes from the compressor?
If the crack is in the back of the chamber where the No Frost system pipes or the evaporator pass, and you hear hissing or see oily spots, this is a freon leak. Glue will not help here; you need to call a specialist to solder the system and refill it.