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5608 posts

Uber Geek


#190842 14-Jan-2016 11:59
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This year, I've tried to glue various items (back) together. The latest is a cracked toilet seat cover. It's plastic. The break is clean and fits perfectly. 

I follow the instructions to the letter.....and all I ever end up with is a gooey gap that never wants to stick. But it certainly WILL stick to my skin should I get any on my finger tips. 

I just tried - again - to glue an item together....and - again - have ended up with a gluey thing in two pieces that clearly never ever intends to stick. 

Are the instructions wrong? It never works.

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892 posts

Ultimate Geek

  #1470846 14-Jan-2016 13:58
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Focusing on the toilet seat:

There is no glue that will work with everything and gluing bits of plastic together is notoriously difficult.

Even if you can glue it together, it may well break at the join when sat upon. There is a lot of stress there.

To get the right glue, you would have to know what type of plastic the seat is made from.

Since these items are pretty cheap, I think that your best bet is just to buy another one.

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Uber Geek


  #1470858 14-Jan-2016 14:09
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I've had good success gluing "unglueable" plastics (polyethelyne/polypropylene) with Selley's Plastic Adhesive - it seems to be superglue in the main tube but it comes with a "primer pen" which makes PP/PE more receptive to being glued.  But I'd not trust it to be structural eg. Toilet Seat, just buy a new one as has been suggested.  

Acrylic glues very well with plain old superglue (cyanoacrylate) as it melts the plastic somewhat forming more of a weld than a glue joint, but it will look "frosty" wherever the glue touches

I don't think I would use araldite for plastics in general unless you have to fill gaps (since it's epoxy resin).  It's very good for china, metal, fiberglass etc though.


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Uber Geek


  #1470880 14-Jan-2016 14:37
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Araldite two part is magic, can stick anything to anything, including you to a toilet seat. Even with a perfect repair I doubt it will be that comfortable. Go buy another one, or better yet, one of these.

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Uber Geek
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  #1470882 14-Jan-2016 14:40
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I used Aruldite (two pot) once to fix a crack in a motorcycle gear box when I was younger as it was leaking oil and it lasted a few years, It actually out lasted the bike

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Uber Geek


  #1470884 14-Jan-2016 14:42
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Two part epoxy glues are better (IMO) at most bonding applications than the instant superglues. The instant ones tend to have poorer shear strength.

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Ultimate Geek


  #1471056 14-Jan-2016 16:22
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locktight 401. put that on your fingers and you will know about it.

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Uber Geek


  #1471061 14-Jan-2016 16:25
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Plastic describes the state of a material, not the material itself.

Find out what the toilet seat is made of, possibly from a recycling code on it and that will help narrow down what might glue it.

But really for something like a toilet seat it seems gross to be sticking it back together when it breaks. Just replace it.

Woman seem to like to close the toilet seat cover and use it as a seat when they are doing bathroom things that take a long time. Perhaps get a stronger one or do what I did and put a stool in the bathroom for them to use instead.



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Uber Geek


  #1471099 14-Jan-2016 17:09
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Plastics - use a solvent-based glue. Test on an inconspicuous part first to see if it will soften. But you will probbaly need to glue on some additional supports. Replace the seat.

Though some plastics are more glue-able than others. My fridge door plastic trays wont glue together strongly, continually breaks when a couple of full 2L bottles of milk, etc, are on the door tray. Ended up screwing a long aluminium L bracket along it's length,

cyanoacrylate glues will go off once to top is open, especially the cheap ones from the 2 dollar stores. Unless you use then straight away. Longevity can be increased by storing in the fridge.

Epoxy - enjoy working with the stuff. No more squiddly 20ml tubes, I use it by the litre. Cut, sanded, coloured, and rock hard. West Systems epoxy. Currently using it for a boat restoration, but have found a myriad of other uses for it around the home.

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1923 posts

Uber Geek

  #1471116 14-Jan-2016 17:21
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Superglue (Cyanoacrylate) works best where it is bonding smooth non-porous surfaces together. Your loo seat is unlikely to be non-porous.

3885 posts

Uber Geek

  #1472339 16-Jan-2016 00:29

timmmay: Araldite two part is magic, can stick anything to anything, including you to a toilet seat. Even with a perfect repair I doubt it will be that comfortable. Go buy another one, or better yet, one of these.

And they are also the only ones AFAIK that have inbuilt backflow prevention as required by the NZ plumbing standards. (Means you don't need external backflow prevention which is expensive)

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Uber Geek

  #1472750 16-Jan-2016 17:49
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I would just replace the toilet seat, probably with one of those slow closing ones. They are not all that expensive from memory.

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