Subject: Re: [Shop-talk] Plastic epoxy/solvent weld

From: Chuck Spalding <[email-masked]>
Date: Wed, 8 Oct 2025 11:38:10 -0700

--===============4899352958515155789==

--000000000000b95e780640a9fe60
Content-Transfer-Encoding: quoted-printable

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=E2=80=AFAM <[email-masked]> =
wrote:

>
> Message: 1
> Date: Tue, 7 Oct 2025 13:18:30 -0500
> From: David Scheidt <[email-masked]>
> To: Jim Stone <[email-masked]>
> Cc: Shop Talk <[email-masked]>
> 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 som=
e
> in the mists of time.  There were two types we used.  One was a thin liqu=
id
> (straight methylene chloride, or very nearly, I think) that was used for
> fabricating stuff with tightly fitted gap free joints.  The other was a g=
el
> that would work for joints with a gap, it had acrylic in it, I think, whi=
ch
> is what gave it gap filling power.  Pick the right sort, based on how wel=
l
> your parts go back together.
>
> [snip]
>
> End of Shop-talk Digest, Vol 19, Issue 151
>

--000000000000b95e780640a9fe60
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_defa=
ult" style=3D"font-family:verdana,sans-serif">This discussion has been very=
 interesting, because I have struggled with glueing plastics.</div><div cla=
ss=3D"gmail_default" style=3D"font-family:verdana,sans-serif"><br></div><di=
v class=3D"gmail_default" style=3D"font-family:verdana,sans-serif">However =
the key point, to me, has not been mentioned: How to identify the <i>type</=
i> of plastic. Can somebody provide clues?</div><div class=3D"gmail_default=
" style=3D"font-family:verdana,sans-serif"><br></div><div class=3D"gmail_de=
fault" style=3D"font-family:verdana,sans-serif">Another challenging questio=
n=C2=A0(for me): What product works well on=C2=A0polyethylene and polypropy=
lene, <i>and</i>=C2=A0has a good shelf life. I have used &quot;Loctite Supe=
r Glue All Plastics&quot;, which works well but is expensive and has a shor=
t shelf life after being opened.</div></div><div class=3D"gmail_default" st=
yle=3D"font-family:verdana,sans-serif"><br></div><div class=3D"gmail_defaul=
t" style=3D"font-family:verdana,sans-serif">Chuck</div><div><br></div><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Oct 8, =
2025 at 11:17=E2=80=AFAM &lt;<a href=3D"mailto:[email-masked]=
.net" target=3D"_blank">[email-masked]</a>&gt; wrote:<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Message: 1<br>
Date: Tue, 7 Oct 2025 13:18:30 -0500<br>
From: David Scheidt &lt;<a href=3D"mailto:[email-masked]" target=3D"_b=
lank">[email-masked]</a>&gt;<br>
To: Jim Stone &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank"=
>[email-masked]</a>&gt;<br>
Cc: Shop Talk &lt;<a href=3D"mailto:[email-masked]" target=3D"_bl=
ank">[email-masked]</a>&gt;<br>
Subject: Re: [Shop-talk] Plastic epoxy/solvent weld<br><br>
<span class=3D"gmail_default" style=3D"font-family:verdana,sans-serif">[sni=
p]</span><br>
<br>
Methylene chloride is the traditional solvent for acrylic welding. It is<br=
now banned for most uses, so newer forulmulations use something else. I<br>
have not used any of them, as I don?t work with acrylic. But I did do some<=
br>
in the mists of time.=C2=A0 There were two types we used.=C2=A0 One was a t=
hin liquid<br>
(straight methylene chloride, or very nearly, I think) that was used for<br=
fabricating stuff with tightly fitted gap free joints.=C2=A0 The other was =
a gel<br>
that would work for joints with a gap, it had acrylic in it, I think, which=
<br>
is what gave it gap filling power.=C2=A0 Pick the right sort, based on how =
well<br>
your parts go back together.<br><br>
<span class=3D"gmail_default" style=3D"font-family:verdana,sans-serif">[sni=
p]</span><br><br>
End of Shop-talk Digest, Vol 19, Issue 151<br>
</blockquote></div></div>
</div>

--000000000000b95e780640a9fe60--

--===============4899352958515155789==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

[email-masked]
Archive: http://www.team.net/pipermail/shop-talk http://autox.team.net/archive

--===============4899352958515155789==--

---

From: Jeff Scarbrough <[email-masked]>
Date: Wed, 8 Oct 2025 16:10:22 -0400

--===============5433643467011796372==

--00000000000001d2a10640ab475f
Content-Transfer-Encoding: quoted-printable

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=E2=80=AFPM Chuck Spalding <[email-masked]=
om>
wrote:

> 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=E2=80=AFAM <[email-masked]=
> wrote:
>
>>
>> Message: 1
>> have not used any of them, as I don?t work with acrylic. But I did do so=
me
>> in the mists of time.  There were two types we used.  One was a thin
>> liquid
>> 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 we=
ll
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.96
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/shop-talk/[email-masked]
>
>

--00000000000001d2a10640ab475f
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">I keep my CA (super glue) in a ziploc bag in the refrigera=
tor.=C2=A0 I&#39;ve had a little tube last years like that.</div><br><div c=
lass=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_=
attr">On Wed, Oct 8, 2025 at 3:06=E2=80=AFPM Chuck Spalding &lt;<a href=3D"=
mailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></d=
iv><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div =
dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-fam=
ily:verdana,sans-serif">This discussion has been very interesting, because =
I have struggled with glueing plastics.</div><div class=3D"gmail_default" s=
tyle=3D"font-family:verdana,sans-serif"><br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:verdana,sans-serif">However the key point, to me, =
has not been mentioned: How to identify the <i>type</i> of plastic. Can som=
ebody provide clues?</div><div class=3D"gmail_default" style=3D"font-family=
:verdana,sans-serif"><br></div><div class=3D"gmail_default" style=3D"font-f=
amily:verdana,sans-serif">Another challenging question=C2=A0(for me): What =
product works well on=C2=A0polyethylene and polypropylene, <i>and</i>=C2=A0=
has a good shelf life. I have used &quot;Loctite Super Glue All Plastics&qu=
ot;, which works well but is expensive and has a short shelf life after bei=
ng opened.</div></div><div class=3D"gmail_default" style=3D"font-family:ver=
dana,sans-serif"><br></div><div class=3D"gmail_default" style=3D"font-famil=
y:verdana,sans-serif">Chuck</div><div><br></div><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Oct 8, 2025 at 11:17=E2=80=AF=
AM &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank=
">[email-masked]</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex"><br>
Message: 1<br>
Date: Tue, 7 Oct 2025 13:18:30 -0500<br>
From: David Scheidt &lt;<a href=3D"mailto:[email-masked]" target=3D"_b=
lank">[email-masked]</a>&gt;<br>
To: Jim Stone &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank"=
fabricating stuff with tightly fitted gap free joints.=C2=A0 The other was =
a gel<br>
that would work for joints with a gap, it had acrylic in it, I think, which=
<br>
is what gave it gap filling power.=C2=A0 Pick the right sort, based on how =
well<br>
your parts go back together.<br><br>
<span class=3D"gmail_default" style=3D"font-family:verdana,sans-serif">[sni=
p]</span><br><br>
End of Shop-talk Digest, Vol 19, Issue 151<br>
</blockquote></div></div>
</div>
_______________________________________________<br>
<br>
<a href=3D"mailto:[email-masked]" target=3D"_blank">Shop-talk@aut=
ox.team.net</a><br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/pipermail/shop-talk" rel=3D"norefer=
rer" target=3D"_blank">http://www.team.net/pipermail/shop-talk</a> <a href=
=3D"http://autox.team.net/archive" rel=3D"noreferrer" target=3D"_blank">htt=
p://autox.team.net/archive</a><br>
<br>
alk/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.=
team.net/mailman/options/shop-talk/[email-masked]</a><br>
<br>
</blockquote></div>

--00000000000001d2a10640ab475f--

--===============5433643467011796372==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

[email-masked]

--===============5433643467011796372==--