Best glue for plastic-plastic? (rough edges, ignore cosmetics)

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Batman

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#208540 16-Feb-2017 10:55

Hi what would be the best way to glue a plastic tubular structure that has snapped off a plastic box? The snap is not clean, jagged edges.

Does not need to be 100% airtight or 100% water tight, but needs to stick together in all conditions. Cosmetic is not important at all.

I have used supaglue before but it is very runny and works best on clean breaks.

Was thinking some kind of silicone and then once dry cover with a layer of some kind of runny glue. ?

Thanks

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#1721074 16-Feb-2017 10:57

Araldite?

Always works pretty well for me.

MikeB4

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#1721077 16-Feb-2017 10:59

not all plastics are the same, you need to get one that suits the material you are working with. If it's PVC Ados F2 should work

ubergeeknz

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#1721078 16-Feb-2017 11:00

What type of plastic is it? For most plastic, superglue works well but the fit-up has to be good. Otherwise I'd agree, epoxy (araldite) is the way to go

Batman

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#1721087 16-Feb-2017 11:14

trig42:

Araldite?

Always works pretty well for me.

Can I get this from bunnings? is it watery runny?

ubergeeknz

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#1721089 16-Feb-2017 11:16

It's two part epoxy, when mixed right it's the consistency of thick honey or so.

But it matters what kind of plastic you're trying to glue. Some plastics are nearly impossible to adhere to, others have specialist adhesives that work well.

Batman

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#1721091 16-Feb-2017 11:17

the "plastic" is exactly the type that makes up your car's air intake system

sidefx

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#1721097 16-Feb-2017 11:22

It wasn't plastic, but I had a heck of a time trying to glue the strap back on a fitbit surge - it was also a fairly jagged\messy break... I tried a couple of "this is best" suggestions from the net and both broke mere days after glue it. In the end though I just got some cheap no name brand superglue from the warehouse and it worked a charm ;-)

(I did manage to super glue my fingers together while fixing it but we shall not speak of that)

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trig42

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#1721100 16-Feb-2017 11:24

Yep, you can get Araldite from Bunnings. Also from your supermarket usually. It comes in a syringe tube with two barrels, you push down the syringe and an equal amount of each part comes out. You mix them together, apply to both things you want stuck, then firmly hold them together for 5 minutes (or longer). It will dry hard and clear.

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#1721101 16-Feb-2017 11:26

sidefx:

It wasn't plastic, but I had a heck of a time trying to glue the strap back on a fitbit surge - it was also a fairly jagged\messy break... I tried a couple of "this is best" suggestions from the net and both broke mere days after glue it. In the end though I just got some cheap no name brand superglue from the warehouse and it worked a charm ;-)

(I did manage to super glue my fingers together while fixing it but we shall not speak of that)

What products did you try that didn't work?

richms

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#1721105 16-Feb-2017 11:29

Since an air intake is a large thing, have a look over it for a recycling code which should help identify what material it is made from.

Unfortunately wont really help with what fillers are in it, which are as much a problem as the actual stuff itself for preventing adheision.

Richard rich.ms

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#1721108 16-Feb-2017 11:31

And make sure it is really clean. Oils/dusts etc from an engine bay will play havoc with any glues.

MikeAqua

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#1721117 16-Feb-2017 11:39

3M 5200 is pretty awesome.

But it won't work if the joint isn't stable.

Mike

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#1721122 16-Feb-2017 11:45

Those two part glues are great, they stick just about anything to just about anything else - including fingers so be careful with it.

richms

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#1721170 16-Feb-2017 12:23

timmmay:

Those two part glues are great, they stick just about anything to just about anything else - including fingers so be careful with it.

Except nylon, only way I have glued that is to rough it up like crazy and add some fiberglass tape on the join, even that broke after a while. Friend suggested plastic welding which looks like a big 3dprinter thing to stick things back together when I had a crack in something similar before.

Richard rich.ms

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#1721234 16-Feb-2017 13:16

richms:

timmmay:

Those two part glues are great, they stick just about anything to just about anything else - including fingers so be careful with it.

Except nylon, only way I have glued that is to rough it up like crazy and add some fiberglass tape on the join, even that broke after a while. Friend suggested plastic welding which looks like a big 3dprinter thing to stick things back together when I had a crack in something similar before.

First step seem to be to fin out what the plastic is. That affects what adhesive or other methods may be applicable.

Mike

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