[Shop-talk] Plastic epoxy/solvent weld

[Jeff Scarbrough]

I keep my CA (super glue) in a ziploc bag in the refrigerator.  I've had a
little tube last years like that.

On Wed, Oct 8, 2025 at 3:06 PM Chuck Spalding <cspalding360 at gmail.com>
wrote:

> This discussion has been very interesting, because I have struggled with
> glueing plastics.
>
> However the key point, to me, has not been mentioned: How to identify the
> *type* of plastic. Can somebody provide clues?
>
> Another challenging question (for me): What product works well
> on polyethylene and polypropylene, *and* has a good shelf life. I have
> used "Loctite Super Glue All Plastics", which works well but is expensive
> and has a short shelf life after being opened.
>
> Chuck
>
> On Wed, Oct 8, 2025 at 11:17 AM <shop-talk-request at autox.team.net> wrote:
>
>>
>> Message: 1
>> Date: Tue, 7 Oct 2025 13:18:30 -0500
>> From: David Scheidt <dmscheidt at gmail.com>
>> To: Jim Stone <1789alpine at gmail.com>
>> Cc: Shop Talk <shop-talk at autox.team.net>
>> Subject: Re: [Shop-talk] Plastic epoxy/solvent weld
>>
>> [snip]
>>
>> Methylene chloride is the traditional solvent for acrylic welding. It is
>> now banned for most uses, so newer forulmulations use something else. I
>> have not used any of them, as I don?t work with acrylic. But I did do some
>> in the mists of time.  There were two types we used.  One was a thin
>> liquid
>> (straight methylene chloride, or very nearly, I think) that was used for
>> fabricating stuff with tightly fitted gap free joints.  The other was a
>> gel
>> that would work for joints with a gap, it had acrylic in it, I think,
>> which
>> is what gave it gap filling power.  Pick the right sort, based on how well
>> your parts go back together.
>>
>> [snip]
>>
>> End of Shop-talk Digest, Vol 19, Issue 151
>>
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