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On Oct 5, 2025, at 17:50, Jim Stone <1789alpine@gmail.com> wrote:
=EF=BB=BFMy granddaughter asked me to fix her favorite hair clip and I=E2=
=80=99d like to
keep my reputation as Grandpa Fixit intact. The part that came off will be
under stress when the clip is used. The plastic didn=E2=80=99t break; the =
larger,
decorative part of the clip came loose from the spring clip. It looks to
me like it was originally solvent welded, not glued.
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=E2=80=99t 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.
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<div dir=3D"ltr"><div dir=3D"auto"><div id=3D"m_4421797582628636719AppleMai=
lSignature" dir=3D"ltr"></div><div dir=3D"ltr"><br></div><div dir=3D"ltr"><=
br><blockquote type=3D"cite">On Oct 5, 2025, at 17:50, Jim Stone <<a hre=
f=3D"mailto:1789alpine@gmail.com"; target=3D"_blank">1789alpine@gmail.com</a=
>> wrote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=
=3D"ltr">=EF=BB=BF<span>My granddaughter asked me to fix her favorite hair =
clip and I=E2=80=99d like to keep my reputation as Grandpa Fixit intact.=C2=
=A0 The part that came off will be under stress when the clip is used.=C2=
=A0 The plastic didn=E2=80=99t break; the larger, decorative part of the cl=
ip came loose from the spring clip.=C2=A0 It looks to me like it was origin=
ally solvent welded, not glued. =C2=A0</span><br></div></blockquote><div><b=
r></div><div><br></div>Methylene chloride is the traditional solvent for ac=
rylic welding. It is now banned for most uses, so newer forulmulations use =
something else. I have not used any of them, as I don=E2=80=99t work with a=
crylic. But I did do some in the mists of time.=C2=A0 There were two types =
we used.=C2=A0 One was a thin liquid (straight methylene chloride, or very =
nearly, I think) that was used for fabricating stuff with tightly fitted ga=
p free joints.=C2=A0 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=
.=C2=A0 Pick the right sort, based on how well your parts go back together.=
=C2=A0=C2=A0</div><div dir=3D"auto"><br></div></div>
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