How to properly glue the back cover on the Xiaomi Redmi smartphone: from the choice of glue to finishing

Replacing the back cover on Xiaomi Redmi smartphones is a challenge that owners face after falls, cracks or a desire to redesign the device. But if dismantling the old panel is more or less clear (the main thing is not to damage the plumes), then sticking a new cover often raises questions. Why does it leave in a week? How to avoid bubbles under the glass? Can you do without professional equipment?

In this article, we will discuss all the stages of the process, from the selection of glue to the final polishing, and also reveal the secrets of the masters who guarantee the long service of the renovated case. Particular attention will be paid to the Redmi Note 10/11/12, Redmi 9/10 and the flagships of the K series, because their design has nuances. If you have never held a hair dryer or scraper in your hands, do not worry: the instruction is adapted for beginners, but with the help of professional life hacks.

We'll warn you right away: the gluing quality depends on the surfaces being prepared, and even the most expensive glue won't save you if you have any grease, dust or old glue marks on your frame or lid, and don't believe the myths of "perpetual" glue: the average life of a factory glue is 2-3 years, and your goal is to get close to that.

1 Which glue to choose: an overview of options and their features

The market offers dozens of types of smartphone adhesive, but only a few are suitable for Xiaomi Redmi. The main criteria for choosing are: clutch strength, elasticity (so that the lid does not crack on impact), and polymerization time.

• 🔹 3M VHB 4910/4950 — professional double-sided tape used in service centers. 0.5–1 mm compensates for the irregularities of the body. 800 ₽ behind the roll) and requires heating to activate.
• 🔹 B-7000 — universal gel glue for electronics, cheap (150-200) ₽), but not suitable for glass covers - over time it turns yellow and loses elasticity.
• 🔹 LOCA (UV-Glue: polymerized under a UV lamp, ideal for glass panels, requires precise application, and it's hard to remove. Price: 300-500 ₽ bottle.
• 🔹 Tesa 61395 - analogue 3M, But thinner (0.2 mm) Suitable for Redmi plastic covers 9A Redmi 8, where the gaps are minimal.

For most Redmi models, the optimal 3M VHB 4910 or LOCA (if the lid is glass), but the Moment or Cyanoacrylate superglue is the worst choice: it is brittle and can damage the plastic when dismantled. If in doubt, check the compatibility of the adhesive with the lid material:

⚠️ Attention: Clay LOCA It requires a UV lamp to polymerize, and without it, the lid will not stick. 3M tesa.

2. Tools: What will be needed for the job

Before you stick the lid, prepare the workplace.

• 🔧 Plastic mediators (2-3 pieces) – for separation of the old cover and alignment of the new.
• 🔥 Hair dryer or thermo-air station - for softening old glue (temperature 60-80)°C).
• 🧴 Isopropyl alcohol (90%+) — surface-degreasing.
• 📏 Device for centering the cover (can be replaced with scotch or strubcines).
• 💡 UV lamp (if you use it) LOCA) or press (for) 3M/VHB).

Professional life hack: instead of strubzins, use heavy books (like a dictionary) wrapped in soft fabric. This will evenly distribute the pressure on the lid. And if there is no hair dryer, an iron at minimum power will work (but hold no closer than 10 cm!).

3. Dismantling the old cover: how not to damage the smartphone

Removing the lid is the riskiest step, and errors here will cause plumes to break (especially the battery or the camera) or damage to the frame.

1. Turn off the phone and remove it. SIM-memory-card.
2. Heat the body with a hair dryer around the perimeter for 2-3 minutes. Keep the hair dryer at a distance of 5-7 cm to avoid melting the plastic.
3. Insert the mediator in the gap between the lid and the frame (start with the charging connector or volume button). Carefully drive it along the body, separating the glue.
4. Lift the lid up to 45.° And make sure it's not clinging to the plumes. If so, gently unplug them.

On Redmi Note 10 Pros and later, the fingerprint scanner plume is often glued to the lid. If you tear it off, you have to change the module (price). ~1500 ₽). Always check the disassembly scheme for your model! for example, for Redmi 9T plumes are arranged like this:

⚠️ Warning: If the lid is cracked, put on gloves! glass shards can cut your hands when heated.

4.Surface Preparation: Secrets of Perfect Adhesion

The quality of the preparation depends on whether the lid will last for years or fall off in a month.

• 🧼 Remove old glue from the frame and the lid. Use a wooden stick or a plastic scraper. For stubborn residues, acetone (but not plastic!).
• 🔍 Check the integrity of seals (for example, around the camera) If they are damaged, replace them with new ones (bought with the lid).
• 🧴 Degrease the surfaces with isopropyl alcohol. Rub with a lilac-free wipe twice: first, removes dirt, second, residues of alcohol.
• 🌡️ Dry for 10 to 15 minutes at room temperature. Humidity is the enemy of glue!

One important thing: the Redmi K50 and Note 12 Pro+ have a metal wafer under the lid for wireless charging. You can't scratch it! If the glue hits the contacts, the charging won't work.

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For better adhesion, lightly shroud the plastic frame with P1000 sandpaper (for matte plastic only!).This will increase the clutch area.

5.Application of glue and installation of the cover: step-by-step technique

Now, to the most critical stage, the technique depends on the type of glue.

Option 1: Double-sided Scotch (3M VHB, Tesa)

1. Cut strips of tape around the perimeter of the lid, leaving holes for speakers and microphones.
2. Remove the protective film on one side and glue the tape to the phone frame.
3. Carefully set the lid, align the holes. Press down the center and walk around the edges.
4. Place your phone under a press (or books) for 12 to 24 hours.

Option 2: Liquid glue (LOCA, B-7000)

1. Apply the glue in a thin layer on the phone frame with zigzag movements.
2. Set the lid and press it slightly. Make sure the glue doesn't leak out of the edges.
3. For LOCA: Illuminate 2 to 3 minutes on each side with a UV lamp. For B-7000: leave for 6 to 8 hours.

⚠️ Attention: If you use LOCA, Don't turn the phone on until it's fully polymerized, and the vibrating of the motor can displace the lid.

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The key to success is uniform pressure, and if the lid is not glued smoothly, it will be almost impossible to fix it in a day without re-disassembling it.

6. Finishing: How to remove excess glue and bubbles

Even with care, defects can remain, and here's how to fix them:

• 💧 Excess glue: remove before polymerization! LOCA — smear-clothing 3M — knife (carefully!).
• 🌀 Bubble under glass: if the lid is glass, warm the bubble with a hair dryer (60)°C) and press it. LOCA — light up with a UV lamp.
• 🔧 Uneven gaps: if the lid protrudes, gently walk with sandpaper P2000 on the edge (for plastic only!).

Redmi Note 11 Pro models often have traces of glue around the camera. To remove them, use a plastic scraper and alcohol - metal tools will scratch the glass.

7. Frequent mistakes and how to avoid them

Analysis of service centers shows that 80% of problems with gluing the lid arise from three errors:

1. Incorrect heating: too high a temperature deforms the plastic, too low a temperature does not soften the glue. Optimal: 70-80 ° C.
2. Savings on glue: a thin layer of tape or glue will not provide a strong grip. For 3M VHB, the thickness should be 0.5-1 mm.
3. Ignoring the centering: If the lid is crooked, it will eventually drive and fall off. Use patterns or paint tape to fix.

Another common problem is a broken fingerprint scanner after assembly, because the plume is damaged or it won't press the lid. Solution: take the phone apart and check the connection (on the Redmi K40, the plume often leaves when it's not built sloppy).

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Before you finish building, turn on your phone and check all the features: camera, speakers, fingerprint scanner, so you avoid re-disassembly.

FAQ: Answers to popular questions