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Old 07-26-2019, 08:57 AM
vybrano vybrano is offline
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Default What type of glue is best for plastic? What could work here?

I took apart a seat.

I have to glue together some cracks in plastic cast. And then glue back vinyl to the plastic cast. (Cast is too old and cracks&brakes if I try to attach vinyl by stapler or even predrilled rivets)

Problem is, that nothing sticks to that plastic cast. I tried super glue, cement glue for PVC pipes, wood glue, epoxy glue, .hot glue gun...after hardening everything peel right of the plastic.

What type of nonexpensive glue could stick to it? The seat was already repaired and somebody used some kind of glue, that looks like it has a sand in it...no idea what glue it is, but it holds perfectly! What could it be?
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Old 07-26-2019, 09:14 AM
Karttekk Karttekk is offline
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Call these people: https://www.eplastics.com/accessorie...ives/pvc-vinyl
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Old 07-26-2019, 09:18 AM
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I would look into treating the plastic first, could be the petroleum is leaching out. Had a similar issue trying to paint some plastic.
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Old 07-26-2019, 09:53 AM
vybrano vybrano is offline
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Quote:
Originally Posted by Karttekk View Post
"This product is restricted in your country."

Hmmm

---------- Post added at 08:53 AM ---------- Previous post was at 08:52 AM ----------

Quote:
Originally Posted by bthompson224 View Post
I would look into treating the plastic first, could be the petroleum is leaching out. Had a similar issue trying to paint some plastic.
I wash it with dish soap and cleaned with acetone. What else could i do... .
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Old 07-26-2019, 11:16 AM
mckutzy mckutzy is online now
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What is this "plastic cast" you are referring to???

Pics of the seat...
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Old 07-26-2019, 11:58 AM
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if it's bakelite you're screwed! it cannot be glued;
most epoxies even fail
haven't tried JB weld tbh but chances are it won't serve you well either.

To know what glue can be used on a specific plastics you MUST know
WHAT plastic you're dealing with.

Is it a thermo or a duraplast;
was it rigid or flexible when new and if what kind of softeners were used.
are those still IN the plastic or have they evaporated out
(dried out plastic can only be discarded I'm afraid)

BEST is plastic welding on thermoplast (take the same material, and apply it carefully by a temperature settable soldering iron)

And second best is whatever glue matches your material

IF superglue won't work, chances are it's a celluloid based plastic..
those cannot be glued and much less welded (duraplast) ..
and the only way left is suitable epoxy (IDK what reliably works tbh I only know some do)
But if it's brittle enough to crack a predrilled hole.. it's likely gone anyways.

Replace with a new part instead.. chances are whatever you do won't hold for very long anyways.

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Old 07-26-2019, 04:57 PM
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ABS and nylon relatively compatible with many epoxies and cyanoacrylate adhesives, and can also be thermally bonded (melted together)

PVC (vinyl) is best solvent bonded

Polyethylene (HDPE, LDPE, UHMW etc) cannot be glued or bonded by any conventional means.
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Old 08-06-2019, 04:30 AM
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Black automotive goop or shoe goo will work! just make sure you Ruffin the surface of the plastic before hand and to hold it in place use slim pan head screws, if you get them short enough you can even leave them in after glue dries ...
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