Detecting a crack on the inside back wall of the refrigerator is always a cause for serious concern for the owner. The damage may look minor, but it is in this area that the thin tubes of which are critical for the operation of the cooling system are hidden. If you notice a chip or crack, the first thing to do is assess the extent of the damage and understand whether the refrigerant is affected. evaporator, whose thin tubes are critical for the operation of the cooling system. If you notice a chip or crack, the first thing to do is assess the extent of the damage and see if the coolant is affected.
In most cases, if the refrigerator continues to freeze and there is no characteristic hissing, then the circuit is intact. However, damage to the integrity of the plastic cannot be ignored, since moisture gets into microcracks, which, when frozen, can expand the damage. In this material we will look at what materials are safe for food and how to properly carry out restoration work. how to repair a crack, which materials are safe for food and how to properly carry out restoration work.
It is important to understand that the back wall is not just a decorative element, but a part of the structure that ensures proper air circulation. Improper repairs can lead to damage to the insulation or, in the worst case, food defrosting. Therefore, before starting work, you should carefully study the structure of your model Indesit, Atlant or LG, since the design may differ.
Diagnostics of damage and risk assessment
Before looking for materials for repair, it is necessary to conduct a thorough diagnosis. Cracks on the back wall most often occur due to the mechanical impact of sharp objects during defrosting or careless cleaning. Visually inspect the damaged area in good lighting. If metal or tubes are visible, the risk of circuit breakdown is extremely high.
Listen carefully: if you hear a hissing or whistling sound, this means freon is escaping. In such a situation, the question of “how to fix it” fades into the background - you need to call a technician to recharge the system. If the refrigerator is working normally, but the plastic has burst, you need to prevent moisture from getting inside the thermal insulation layer.
⚠️ Attention: If you smell oil or see oily spots when you touch a crack, do not plug in the refrigerator under any circumstances. This is a sign of depressurization of the compressor or circuit, which requires professional intervention.
Assess the size of the damage. Small scratches and microcracks up to 1 mm can simply be sanded and covered with a layer of sealant. Larger chips require installation reinforcing patch. If the crack runs along the entire wall or has a branching structure, you may need to partially replace the plastic panel, which is more difficult, but sometimes necessary.
Choosing a safe material for repair
The main criterion when choosing a material is its safety for food and resistance to low temperatures. Regular construction silicone or Moment adhesive can release toxins when cooled or crack in the cold. You need specialized compounds that maintain elasticity at temperatures down to -20 degrees.
One of the best options is Food-grade epoxy glue. It creates a durable, chemically inert compound that is not afraid of moisture and cold. Two-component polyurethane sealants have also proven themselves to be excellent. They dry quickly and form a rubber-like surface that does not burst during thermal expansion of the plastic.
- 🧪 Food-grade epoxy glue -ideal for rigid fixation and filling deep cavities, non-toxic after polymerization.
- ❄️ Frost-resistant sealant —suitable for surface treatment, retains flexibility, but is less tensile.
- 🛡️ Specialized repair kits —often sold for restoring bathtub enamels, but is also suitable for plastic refrigerators.
It is not recommended to use regular silicone sealant for bathrooms, even if it is labeled “antiseptic”. It may contain fungicides that are undesirable in close proximity to food, and also has poor adhesion to icy surfaces. It is critical to use only formulations labeled “food grade” or “food grade” after drying.
Preparing the surface for restoration
The quality of repairs depends 90% on surface preparation. Even the most expensive glue will not stick to a greasy, wet or icy wall. The first step is to completely defrost the refrigerator. Unplug the appliance, remove all food and leave the doors open for at least 12 hours.
After defrosting, dry the chamber thoroughly. Use a hair dryer on cold setting or just a soft rag. The area around the crack must be degreased. For this, alcohol or a special degreaser is best suited, but not acetone, since it can dissolve the plastic itself, making the crack even larger.
☑️ Preparation for repair
If the edges of the crack are sharp or have burrs, they must be carefully cleaned with fine sandpaper. This will increase the area where the glue adheres to the plastic. Try not to press too hard to avoid worsening the damage. After cleaning, be sure to remove all plastic dust with a dry brush or cloth.
Technology for applying sealant and sealing
The process of applying the material depends on the selected type of composition. If you are using a two-part epoxy, mix the components in the proportions specified by the manufacturer immediately before use. You will have a limited time (the “lifetime” of the mixture), so you need to act quickly and accurately.
Apply the composition with a spatula or plastic spatula, lightly pressing it into the crack. It is important that the material fills the entire damage cavity without leaving air bubbles. If the crack is through, it is advisable to place something smooth on the back side (behind the plastic) so that the glue does not leak inside the case towards the insulation.
| Type of damage | Recommended material | Drying time (min.) | Features |
|---|---|---|---|
| Fine scratch | Liquid plastic | 30-60 | Requires minimal preparation |
| Chip up to 2 mm | Epoxy glue | 120-240 | Needs degreasing |
| Crack > 2 mm | Epoxy + patch | 360+ | Requires mesh reinforcement |
| Through hole | Cold welding | 1440 (24 hours) | Maximum strength |
For large cracks, it is recommended to use the reinforcement method. A piece of fiberglass or fine metal mesh is placed on top of the first layer of glue, which is then covered with a second layer of the composition. This creates a kind of “plaster” that will prevent further separation of the edges.
The nuances of working with epoxy
When working with epoxy resin, it is important to observe the temperature regime. If the room is too cold (below +15°C), polymerization may not complete and the adhesive will remain sticky. It is better to carry out repairs in a warm room.
Drying time and checking the result
After applying the material, the most important stage begins - waiting. Don't rush to turn on the refrigerator right away. Complete polymerization of most compositions takes from 12 to 24 hours. Violation of this regime will lead to the fact that, under the influence of cold and condensation, the uncured glue will lose its properties.
During the drying time, ensure good ventilation in the room, since even safe compositions in a liquid state can have an odor. Do not touch the repaired area with your fingers and do not test it "tooth". Allow the chemical reactions to complete their cycle.
⚠️ Attention: If you feel that the glue remains sticky after the specified time has elapsed, do not turn on the refrigerator. Extend drying for another day or remove the layer and reapply; the mixing proportions of the components may be incorrect.
When the time is up, carefully inspect the seam. It should be hard, homogeneous and not sticky. Only after this can a test run be carried out. Turn on the refrigerator without food and leave it running for 2-3 hours, monitoring the appearance of new cracks or condensation in the repair area.
Common mistakes when doing DIY repairs
Many owners try to save time and use improvised means that are absolutely not suitable for this task. For example, using ordinary plasticine