How to install an acrylic insert in a bathtub: instructions for installing the liner


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Bath liner

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An acrylic liner is a unique way to tidy up a bathtub that has lost its appeal or is leaky. It was invented and patented by Slovenian engineers, and today is in ever-growing demand among residents of Moscow and the regions.

Inlay manufacturing technology

An acrylic insert used to restore the appearance of an old bathtub visually resembles a cover placed on top. It allows you to return lost performance qualities to a sanitary container in a matter of hours.

This restoration option has been used for several decades by Americans, Europeans, and for 2 decades by our fellow citizens. This is an affordable and convenient way to get the desired result without unnecessary dirt.


This technology involves putting a thin liner on a powerful frame from an old bathtub that has lost its visual appeal.

The most important thing about an acrylic liner is its quality. Therefore, when choosing this product for home, you need to pay attention to manufacturers with a good reputation. Otherwise, even a conscientious installation will not save the situation - the insert may burst after a month of use.

The plumbing market offers liners made from the following materials:

  • medical acrylic;
  • two-layer plastic – ABS/acrylic;
  • ordinary plastic;
  • technical acrylic.

Regular plastic and technical acrylic are used by unscrupulous manufacturers. They present their products as high-quality products at an affordable price. But such savings will backfire in just the second month.

Plumbing medical acrylic (PMMA) has been replaced by two-layer acrylic for the last couple of years. The fact is that ABS/acrylic material has the best performance qualities. Thus, it is more impact resistant compared to fragile acrylic.

The technological process of manufacturing inserts is complex and requires the skill of a craftsman and the availability of expensive equipment. In artisanal conditions, the production of high-quality products is impossible.

The plant has all the necessary equipment from foreign manufacturers. The material is also foreign and meets hygienic requirements.

To make liners, they take a single-color sheet of cast acrylic with a thickness of 0.6 cm and, under the influence of vacuum and high temperature, give it the desired shape on a machine. For molding, special molds made of aluminum or synthetic composite are used.

Two-layer plastic is essentially a monolithic material that can be molded in the same way as pure acrylic. It is important that the thickness of the acrylic layer is 0.5 cm or higher. Indeed, in products with a 2 mm layer, the operating surface is quickly damaged.

The overwhelming number of foreign manufacturers and all domestic ones use ABS/PMMA material. The upper hygienic layer has dirt-repellent and antimicrobial properties, and the lower one ensures the reliability of the product.

The shape of the old bathtub is important. Not all models can be purchased with an acrylic liner. Large factories have up to 20 different dies for the production of inserts for the most common cast iron and steel products. If during the measurement process it was discovered that the bathtub is non-standard, then you will have to choose an alternative upgrade option.

Factories produce only a certain number of earbud models. After all, the cost of the form itself is quite high, so making it to order for each client is unprofitable

You should not trust private manufacturers who promise to make an insert for a specific model. It will be very expensive and no one can vouch for the quality of the product.

Also, in the case of a non-standard model, you cannot buy a slightly smaller liner. According to the “bath within a bath” restoration technology, it should be like a second skin, worn over the old product.

Features of choosing acrylic inserts

Before installing a new liner in a peeling bathtub, you need to choose a quality option. After all, the market is replete with tempting offers, and no one is immune from the desire to save money. But the savings must be justified - it is better to do the installation work yourself than to buy a cheap fake.

To buy a good insert, you should follow the basic rules. Firstly, a quality product must have accompanying quality documents, a manufacturer’s warranty of at least 3 years, a factory logo and recommendations for use and care.

If the seller does not show documents confirming the quality or the warranty period is a year or less, then it is better to bypass such an insert. Even when the low price tempts you to buy

Secondly, the factory earbuds are covered with a protective film on top. It should be removed only before use, when all gluing work is completed and everything is dry.

Thirdly, the plumbing product should not be translucent. You need to check whether the selected option meets this requirement by looking through the insert into the sun, a lit lamp, or shining a flashlight from the back.

Fourthly, the acrylic surface of a high-quality insert is flat and smooth. Scratches and chips on the purchased copy are unacceptable. If the product was delivered by a courier, then you should sign the documents and release it only after a thorough inspection of the delivered goods.

If the product is flimsy, translucent, or, even worse, bends under your hand, then you should refuse the purchase. It has nothing to do with the acrylic liner

Fifthly, the thickness of a high-quality acrylic coating is from 5 mm. This must be confirmed by accompanying documents.

Sixth, you need to buy only from trusted companies. Conscientious manufacturers with a good reputation have no point in deceiving their clients. Thus, LLC ISKomp, Plastall, SevenLux, Multiplast and Grand Plast have proven themselves well on the Russian market. They use Austrian raw materials and German equipment.

Seventh, the size of the purchased liner must clearly correspond to the size of the bath being updated. To do this, before purchasing, you should measure the height, width and depth of your container. It is unacceptable to take a smaller or mismatched insert, even if the seller states otherwise. His arguments that all the voids will be well filled with polyurethane foam speak of unprofessionalism.

To correctly take the measurements of your bathtub, you need to measure its internal and external length at the top, the width at the head and legs, and also the depth

Algorithm for repairing a bathroom with a liner

  • The insert is selected according to size and delivered to the site;
  • An acrylic insert is installed in the bathroom;
  • Technological drain and overflow openings are made;
  • Corners and sides are installed.

Working time: 2 hours

Bathtub before installing acrylic liner

Dismantling the “drain-overflow” and tiles around the perimeter of the bathtub

Preparing for installation:

  • grinding
  • installation of a new “drain-overflow”
  • sealing with sanitary silicone

Application of two-component foam

Installing an acrylic liner with a decorative border and tiles around the perimeter of the bathtub

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Why do you need an acrylic insert in the bathroom?

Often, bathtubs in modern apartments and houses are tightly sandwiched between the walls of a small room and sealed with special sides. Therefore, the thought that a heavy cast iron container needs to be replaced, which means pulling it out, disposing of it, buying and installing a new one, causes panic.

An acrylic bathtub liner will help solve the problem without much hassle and expense - in fact, this is another bathtub, slightly smaller in size, which is inserted into the old one and attached to it with a special compound and mechanical devices.

The acrylic liner is made from a special sanitary material, the composite composition of which is reinforced with ABS plastic.

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Secrets of acrylic inlay longevity

It is the quality of the insert itself that ensures 70% of the service life, and 20% for correct installation. The remaining 10% are the conditions for care and use of the product. Thus, the last step towards the longevity of the installed liner is proper operation and care.

When a good liner was purchased, but it was installed by a crooked master, water begins to accumulate under the coating. Over time, it stagnates - mold appears and a disgusting aroma appears in the bathroom. But this situation can be overcome as a result of competent repair work, and the insert itself will last for a long time.

You can use the updated bathtub in an acrylic case in the same way as the old one. You can’t just pour boiling water into it, throw knives and bricks.

Do not leave burning candles unattended on the sides of the bathtub - they can fall and burn a hole in the acrylic layer

If you are going to renovate the bathroom, it is better to cover the surface of the container with film and a soft cloth. After all, tiles knocked off the walls can severely damage the acrylic layer. Do not drop a dismantled sink or toilet - the liner may crack. Further restoration will be impossible - only removing and gluing in a new one.

As for caring for the acrylic liner, it is afraid of abrasive liquid and powder products. Also, it does not tolerate long-term stagnation of dirt.

After using the updated bathtub, it should be treated with a soft soapy sponge and rinsed with water. To wash the liner, you can use products produced for acrylic bathtubs.

In case of deep scratches and small cracks and other types of damage, the acrylic liner can be restored. To do this, purchase a special repair kit, restorer and polishing paste. To ensure that the tone of the applied product does not differ from the original coating, it should be purchased from the same manufacturer.

Advantages of acrylic liner

The advantages of a bathtub renovation liner are the following:

  • low cost of construction compared to a new metal or polymer bowl;
  • acrylic inserts allow you to restore any bathtubs (polymer, cast iron, steel);
  • thermal conductivity is lower than that of metals, so the liner has a comfortable temperature and retains the heat of the water longer;
  • due to its small thickness and density, the design is lightweight, which simplifies self-installation;
  • acrylic is resistant to corrosion and hygienic, even if scratches occur, rust and fungus do not appear on it;
  • When changing the design of the bathroom, you can use a polymer liner to change the color of the bowl.

The service life of liners, depending on their thickness, quality and operating characteristics, is 10-15 years. Improper care can shorten it to 5 years.

Why choose acrylic?

When deciding for yourself whether an old bathtub needs an acrylic liner, you need to pay attention to its significant advantages. Perhaps friends or relatives have already used it and have had a positive experience. It’s good to cooperate with a company that officially represents the manufacturer and has good reviews from real people.

The acrylic insert has an aesthetic appearance. It is endowed with dirt-repellent properties. The polymer itself has no pores in which bacteria can multiply, so the product is safe for bathing children and people with delicate or sensitive skin.

Also, allergy sufferers can safely take a bath - the acrylic insert has a natural snow-white color. No dyes are used in the production process.

The updated bathtub is strong and stable, because the old container, tested over the years, acts as a frame, and the new liner has a safe and beautiful surface

The PMMA material applied on top of the ABS layer is resistant to minor scratches. If damage does occur, it can be repaired using a special acrylic repair kit.

Another advantage is ease of maintenance. A soft sponge and soap solution are enough to clean the surface of the acrylic insert.

But all this applies only to high-quality products that have the appropriate documents from the manufacturer.

Sometimes you may encounter the unfortunate experience of installing an acrylic insert. Here, most often, the owner’s excessive savings are to blame. By choosing a cheap Chinese shell instead of a high-quality liner and hiring a crooked craftsman to install it, you get a beautiful cheap bathtub for 1 week/month. After a short time, the pseudo acrylic liner will burst beyond repair.

Advantages of the “bath in a bath” technology

Relatively recently, we became aware of the technology for restoring bathtubs using this method. Surprisingly, she became very popular. And here are the reasons:

  • Installation of the acrylic liner is very quick. Literally three hours after the start of work, you will be able to see the updated bathtub. And in a day you will be able to use it for its intended purpose.
  • All work is carried out without the involvement of qualified specialists. If you decide to update your bathtub using the enameling method, it will be more difficult to achieve a positive result.

Bathtub restoration using acrylic liners is only permissible for cast iron/steel bathtubs.

Let's figure out how to choose an acrylic liner.

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