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Exploring Materials to Fill and Refurbish Broken Plastic Housing Corners

KSRhaziel 44826 26
Best answers

What material and repair method can I use to fill a broken corner in a plastic housing so it can be sanded and, if needed, painted?

The best repair is to rebuild the missing area with the same type of plastic as the housing, weld it in with a soldering iron or plastic welder, and then finish it with filing and wet sanding before painting if needed [#7920411][#7886788] For ABS housings, people recommend cutting a piece from another ABS casing or even plugs and melting it in; this gives the closest match in behavior to the original plastic [#7886788] If you do not want to weld plastic, two-component epoxies and repair compounds such as epoxy putty, Poxipol, Poxilina, or PermaPoxy can be used and then sanded smooth, but they are best for rigid areas and may separate on parts that flex [#7881843][#7885939][#7887445][#7909179][#7969456] For larger missing sections, a polyester car filler with glass fiber was also recommended because it hardens in about half an hour and is easy to grind [#7969456] A practical approach mentioned by users is to back the hole with a piece of plastic, fill over it with epoxy or putty, let it harden, then sand the excess flush and paint the area [#7889017][#7955525]
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  • #1 7881741
    KSRhaziel
    Level 36  
    Posts: 3248
    Help: 271
    Rate: 275
    It sometimes happens that a piece of the casing (on the corner, on the side, etc.) breaks under undefined circumstances and then the wind rushes around the casing. Recently I was wondering what could be filled in such a hole? Initially, I was thinking about some Poxipol, which then could be nicely sanded and possibly painted. However, its original purpose was hardly ever the filler.
    So, has anyone already tested some means that could be used to fill a broken plastic housing and then (though not necessarily) grind it nicely?
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  • #2 7881843
    sim_
    Level 18  
    Posts: 194
    Help: 22
    Rate: 26
    Hello, recently I was repairing a hole in the plastic casing (hole about 3 cm) by filling the cavities with "EPOXY" putty - epoxy metal repair compound. After hardening, it is perfect for further processing, it is very hard. After sanding, I got a perfectly smooth and hard surface. Regards Janek.
  • #3 7882054
    kosmik903
    Level 17  
    Posts: 327
    Help: 13
    Rate: 29
    I recently used poxilina (I combined plastic with metal and filled metal losses), but it needs to be modeled quickly because after 5 minutes it becomes hard and cannot be moved.
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  • #4 7882530
    askr
    Level 35  
    Posts: 2699
    Help: 302
    Rate: 363
    I used to use two-component adhesives - poxipol and similar.
  • #5 7882967
    dicappo
    Level 20  
    Posts: 474
    Help: 1
    Rate: 24
    Someone will write with plaster in a moment. How much does EPOXY cost?
  • #7 7885939
    Dr.Zepsuj
    Level 20  
    Posts: 472
    Help: 6
    Rate: 34
    I complement it with plastic, similar to the one from the given housing. I stick to what the plastic holds. Then processing with a file, 300, 1000, 2000 paper wet, polishing. Effect - it's actually hard to notice anything. I have repaired, for example, rear lamps for a car or defects in a mobile phone - when I was selling it later in a purchase facility, they did not notice it, even though they carefully looked at it.
  • #8 7886788
    karczochrulez
    Level 14  
    Posts: 79
    Help: 2
    Rate: 6
    if the housing is made of ABS (and this is most often the case in PCs), then just cut a piece from another housing or the plugs and melt in with a soldering iron. The corner of the housing can be bent in advance by heating with a heat gun or over a gas

    ABS is the same as car bumpers
  • #9 7887445
    ArturAVS
    Moderator
    Posts: 26097
    Help: 2295
    Rate: 7733
    Hello

    Recently, I used PermaPoxy plastic glue for small holes and cracks. Two-component fact stinks mercilessly. But after binding
    behaves almost like the original material. Easy to process with a file or sandpaper. I recommend. Only this stench .......
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  • #10 7889017
    dreaper
    Level 18  
    Posts: 354
    Help: 12
    Rate: 141
    I also use a two-component epoxy glue, but it did not cost me more than PLN 6 and it works just as well - it is quite thin at the beginning and it dries two days, but after drying it is hard and flexible at the same time, besides, it is easy to sand down. So that nothing is visible from the top, I first glue the bottom with a piece of plastic, because the glue is quite thin and otherwise it would be difficult to fill the hole with it, the hole in the housing so that the piece of plastic on the bottom is larger than the defect, then I pour the epoxy mixture on top and leave it until solidified. I sand the excess with sandpaper to level the surface. Then I paint the whole thing with "deodorant" and it's also hard to notice anything.

    You can also trace a hole on the paper, cut it and stick it on the treated piece of plastic with which you intend to fill the defect in the housing - there is more work and the effect is the same, but less glue comes off :)

    As for the wind in the housing, I think it is appropriate, but it was probably just a metaphor.
  • #11 7892464
    sim_
    Level 18  
    Posts: 194
    Help: 22
    Rate: 26
    Hello,
    dicappo wrote:
    Someone will write with plaster in a moment. How much does EPOXY cost?
    ,
    I paid PLN 14 for Epoxy. Regards Janek.
  • #12 7895274
    Rychuu
    Level 21  
    Posts: 618
    Help: 20
    Rate: 44
    When I changed the look of my casing, I glued it with poxipol and the rest I did with a universal, finishing putty (the one without additives). Easy to process, cheap and looks very good.
  • #13 7897546
    katar83
    Level 26  
    Posts: 814
    Help: 66
    Rate: 25
    In my opinion, it is best to fuse the plastic pieces with the soldering iron in the cavities. I 'glued' many cases in this way, especially for Toshib with broken corners and the effect is amazing. In fact, after painting by a friend of the painter, they look better like new.
    The glue is fine in places where the housing does not bend. In the case where the hole is in the place where the housing bends slightly, the glue will go sooner or later.
  • #14 7904234
    xamrex
    Level 28  
    Posts: 1668
    Help: 82
    Rate: 341
    You can buy a skin for a laptop.
    Then it will look very nice.
  • #15 7909179
    Anonymous
    Anonymous  
  • #16 7912891
    Pisklak
    Level 16  
    Posts: 348
    Help: 3
    Rate: 17
    Hmm, has anyone tried fiberglass? Later treatment with putty for cars.

    Opinions?
  • #17 7920086
    vegoyska
    Level 12  
    Posts: 74
    Help: 2
    Rate: 4
    Car putty, maybe hot glue?
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  • #18 7920341
    Anonymous
    Anonymous  
  • #19 7920411
    AnnoDomi
    Level 27  
    Posts: 767
    Help: 104
    Rate: 113
    It is best to fill the defect with the same type of plastic and weld a plastic welder / hot water machine and then treat it with paper, including water. Putty and epoxy do not work the same thermally or mechanically as plastic, so they quickly separate from plastic, unless it is a solid and non-working material.
  • #20 7920539
    Anonymous
    Anonymous  
  • #21 7939249
    Anonymous
    Anonymous  
  • #22 7939743
    Dr.Zepsuj
    Level 20  
    Posts: 472
    Help: 6
    Rate: 34
    You can hot air, but you can also make a lot of trouble this way. The casing likes to shrink at the point of the crack and additional larger holes are created. I used to stick old, tired plastic like that and it behaved very unpredictably.
  • #23 7939756
    Niewidzące OKO
    Level 11  
    Posts: 28
    Help: 1
    Rate: 4
    vogelek23 in my opinion it is just a waste of time, you should buy the entire laptop, not just the case :) who would waste time on such stupidities as replacing the housing :D

    Greetings.
  • #24 7940096
    katar83
    Level 26  
    Posts: 814
    Help: 66
    Rate: 25
    A colleague of vogelek is somewhat right. It all depends on the finances in this matter. Either we like the casing and I glue it, which usually takes a few days and also costs, or we buy a new one, which does not cost a lot.
    Personally, I glued a few flaps, but only because the new flap cost 1/4 the value of the laptop. Usually, however, it is a maximum of 1/10, so I replace it with a new one.
    The whole procedure consists in fusing pieces of plastic with a soldering iron in the missing places, then grinding and painting with the cheapest primer and car spray. The can costs 5 PLN here. The hatch looks like new.
  • #25 7955525
    mazi0000
    Level 21  
    Posts: 558
    Help: 32
    Rate: 108
    You put a piece of plastic in this place and stick it, then putty it in place, after the putty dries, you sand it with sandpaper.
  • #26 7969320
    kemot94
    Level 11  
    Posts: 7
    I also used two-component adhesives that are the best
  • #27 7969456
    Mr0weq
    Level 12  
    Posts: 41
    Help: 1
    Rate: 3
    For larger losses and the possibility of grinding, I use a polyester car putty with glass fiber. It hardens for half an hour. For small ones - rather epoxies. Pasting with a soldering iron only occasionally - often increases the area of damage. I happened to reinforce a cracked laptop cover with a bent piece of aluminum stuck to epoxy. If the fracture site transmits high forces, then filling the cavity alone may not be enough.

Topic summary

✨ The discussion revolves around methods for repairing broken plastic housing corners. Various materials and techniques are suggested, including epoxy putty, two-component adhesives like Poxipol, and plastic welding using a soldering iron. Users recommend specific products such as PermaPoxy and Chester Molekular materials for their effectiveness and ease of processing. Techniques for sanding and painting the repaired areas are also discussed, with emphasis on matching the plastic type for better results. Some participants suggest replacing the casing entirely if the damage is significant or if the repair is too labor-intensive. The conversation highlights the importance of using compatible materials to ensure durability and aesthetic quality in repairs.
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FAQ

TL;DR: 80 % of laptop and PC shells are ABS plastic [PlasticsEurope, 2023]. “Same material – same parameters” [Elektroda, Anonymous, post #7920539] Two-part epoxy putty fills 3 cm gaps in ≈30 min [Elektroda, sim_, post #7881843] Why it matters: quick, invisible repairs save up to 90 % versus buying a new housing.

Quick Facts

• ABS plastic melts at 221 °C and can be fusion-welded with a 350 °C soldering tip [ABS Datasheet]. • Two-component epoxy cures in 5–120 min; Shore-D hardness ≈80 after 24 h [Loctite TDS 2022]. • DIY epoxy putty costs PLN 6–14 per 56 g stick [Elektroda, dreaper, #7889017; sim_, #7892464]. • Polyester + fiberglass filler hardens in ≤30 min and resists 140 °C [3M Body Filler, 2022]. • Hot-glue repairs are 3× harder to sand and paint than epoxy patches [Elektroda, Anonymous, post #7920341]

What’s the most reliable filler for cracked plastic corners?

Two-component epoxy putty bonds well, sands smooth, and matches plastic rigidity [Elektroda, sim_, post #7881843]

Is epoxy putty easy to sand after curing?

Yes. After full cure (≈24 h) it files like hard plastic [Elektroda, sim_, #7881843; Loctite TDS 2022].

How much will two-part epoxy cost me?

Polish market price ranges PLN 6–14 per stick/tube [Elektroda, dreaper, #7889017; sim_, #7892464].

How do I avoid shrinkage when heat-welding plastic?

Keep the gun moving, limit temperature to 250 °C, and pre-fit a scrap backer. Overheating causes holes [Elektroda, Dr.Zepsuj, post #7939743]

Are premium kits like Chester or Wurth worth it?

They offer higher tensile strength but cost 3–5× DIY epoxies; choose them for mission-critical enclosures [Elektroda, jerry1960, post #7885480]

Quick 3-step fix for a 3 cm hole?

  1. Tape plastic backing underneath.
  2. Pack hole with epoxy putty.
  3. After 24 h, file and wet-sand to 2000 grit [Elektroda, dreaper, post #7889017]

When should I replace the entire casing?

If repair time exceeds hourly rate or new shell is <10 % device value, replacement wins [Elektroda, Anonymous, #7939249; katar83, #7940096].

How durable is a fiberglass patch on electronics?

It withstands 140 °C and high impact, making it ideal for load-bearing areas [3M Body Filler, 2022].

How long before I sand freshly mixed epoxy?

Light shaping is possible after 30 min; wait full cure (24 h) for final finish [Loctite TDS 2022].
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