I am planning a "touchy" repair job to my canopy. I've done some test
sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
the ugly bubbles and noticed some fine plexiglas stress cracking on
one test piece. Is there another sort of cement (eg. Weld-On #40)
which would make for a better looking bond between 2 sheets of .080 in
plexiglas? Thanks.

Larry

On Sun, 04 Nov 2007 21:09:01 -0800, Larry > wrote:

>I am planning a "touchy" repair job to my canopy. I've done some test
>sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
>the ugly bubbles and noticed some fine plexiglas stress cracking on
>one test piece. Is there another sort of cement (eg. Weld-On #40)
>which would make for a better looking bond between 2 sheets of .080 in
>plexiglas? Thanks.
>
>Larry

isnt chloroform a thin solvent suited to wicking into plexiglas
cracks?

Stealth Pilot

On Nov 5, 2:37?am, Stealth Pilot >
wrote:
> On Sun, 04 Nov 2007 21:09:01 -0800, Larry > wrote:
> >I am planning a "touchy" repair job to my canopy. I've done some test
> >sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> >the ugly bubbles and noticed some fine plexiglas stress cracking on
> >one test piece. Is there another sort of cement (eg. Weld-On #40)
> >which would make for a better looking bond between 2 sheets of .080 in
> >plexiglas? Thanks.
>
> >Larry
>
> isnt chloroform a thin solvent suited to wicking into plexiglas
> cracks?
>
> Stealth Pilot

Stealth: Yes it is but my repair patch is not a perfect match due to
curved surface so some air pockets would prevent complete wicking. I
thought maybe a thicker solvent could possibly work better. It is not
a structural requirement. Thanks

Larry

On Nov 5, 7:37 am, Larry > wrote:
> On Nov 5, 2:37?am, Stealth Pilot >
> wrote:
>
> > On Sun, 04 Nov 2007 21:09:01 -0800, Larry > wrote:
> > >I am planning a "touchy" repair job to my canopy. I've done some test
> > >sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> > >the ugly bubbles and noticed some fine plexiglas stress cracking on
> > >one test piece. Is there another sort of cement (eg. Weld-On #40)
> > >which would make for a better looking bond between 2 sheets of .080 in
> > >plexiglas? Thanks.
>
> > >Larry
>
> > isnt chloroform a thin solvent suited to wicking into plexiglas
> > cracks?
>
> > Stealth Pilot
>
> Stealth: Yes it is but my repair patch is not a perfect match due to
> curved surface so some air pockets would prevent complete wicking. I
> thought maybe a thicker solvent could possibly work better. It is not
> a structural requirement. Thanks
>
> Larry

Acrifix 192 is a good material for this. It is fairly viscous and can
be worked just like the plexi when it's cured. It is UV cured.

Most of the sailplane online stores will carry it (Knauff & Grove,
Wings & Wheels, Cumulus, etc.)

Craig

On Nov 4, 9:09 pm, Larry > wrote:
> I am planning a "touchy" repair job to my canopy. I've done some test
> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> the ugly bubbles and noticed some fine plexiglas stress cracking on
> one test piece. Is there another sort of cement (eg. Weld-On #40)
> which would make for a better looking bond between 2 sheets of .080 in
> plexiglas? Thanks.
>
> Larry

#16 is just the water thin #3 with acrylic dust pre-dissolved in it to
make it thick, it's still the same action, I.E. softening the existing
acrylic, then evaporating away.

If you have gaps in particular, #40 is the shizz you want. It
actually is syntesizing new, full strength acrylic, and not just
softening up your substrate. Years ago, I built a planing boat towing
tank model out of acrylic sheet, and #40 worked far better than the
Methyl Chloride solvent cements, gaps and all. Once cured, it works
just like the base material, and polishes up nice. It can be a little
different tint, it's not quite as gin-clear.

Chloroform would probably work, but I think you mean methylene chloride.

David

Stealth Pilot wrote:
> On Sun, 04 Nov 2007 21:09:01 -0800, Larry > wrote:
>
>> I am planning a "touchy" repair job to my canopy. I've done some test
>> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
>> the ugly bubbles and noticed some fine plexiglas stress cracking on
>> one test piece. Is there another sort of cement (eg. Weld-On #40)
>> which would make for a better looking bond between 2 sheets of .080 in
>> plexiglas? Thanks.
>>
>> Larry
>
> isnt chloroform a thin solvent suited to wicking into plexiglas
> cracks?
>
> Stealth Pilot

On Nov 5, 1:26?pm, flybynightkarmarepair > wrote:
> On Nov 4, 9:09 pm, Larry > wrote:
>
> > I am planning a "touchy" repair job to my canopy. I've done some test
> > sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> > the ugly bubbles and noticed some fine plexiglas stress cracking on
> > one test piece. Is there another sort of cement (eg. Weld-On #40)
> > which would make for a better looking bond between 2 sheets of .080 in
> > plexiglas? Thanks.
>
> > Larry
>
> #16 is just the water thin #3 with acrylic dust pre-dissolved in it to
> make it thick, it's still the same action, I.E. softening the existing
> acrylic, then evaporating away.
>
> If you have gaps in particular, #40 is the shizz you want. It
> actually is syntesizing new, full strength acrylic, and not just
> softening up your substrate. Years ago, I built a planing boat towing
> tank model out of acrylic sheet, and #40 worked far better than the
> Methyl Chloride solvent cements, gaps and all. Once cured, it works
> just like the base material, and polishes up nice. It can be a little
> different tint, it's not quite as gin-clear.

Hello Above: Was talking with Ridout plastic techs yesterday. They
warned me about possible stress fracture when cementing plexiglas that
is not "cast cured". In other words plexiglas that is "extruded" has
stress in it and many solvents will cause hair line stress fractures
when applied. This makes me nervous about bonding a 7 inch plexiglass
ring to my canopy. .083 in thickness. Any ideas about cast vs.
extruded and potential problems?

Thanks

Larry

On Mon, 05 Nov 2007 22:16:40 GMT, David Kazdan > wrote:

>Chloroform would probably work, but I think you mean methylene chloride.
>
> David
>
no.
anaesthetic chloroform although it probably hasnt been used as an
aesthetic in years.
applied by dipping a fine point artist brush in the stuff and then
touched to the closed up crack, it wicks in , does its stuff and then
evaporates.

>Stealth Pilot wrote:
>> On Sun, 04 Nov 2007 21:09:01 -0800, Larry > wrote:
>>
>>> I am planning a "touchy" repair job to my canopy. I've done some test
>>> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
>>> the ugly bubbles and noticed some fine plexiglas stress cracking on
>>> one test piece. Is there another sort of cement (eg. Weld-On #40)
>>> which would make for a better looking bond between 2 sheets of .080 in
>>> plexiglas? Thanks.
>>>
>>> Larry
>>
>> isnt chloroform a thin solvent suited to wicking into plexiglas
>> cracks?
>>
>> Stealth Pilot

Wonder how silicone would do? They use it to make home aquariums. I
use it for holding lots of things - small sheet metal covers for wing
bolt holes, txpdr antenna metal base to my composite plane.......
Holds great. And it flexes slightly to help with differential heat
expansion (your cracking problem?). Just let it cure overnight.

On Nov 4, 11:09 pm, Larry > wrote:
> I am planning a "touchy" repair job to my canopy. I've done some test
> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> the ugly bubbles and noticed some fine plexiglas stress cracking on
> one test piece. Is there another sort of cement (eg. Weld-On #40)
> which would make for a better looking bond between 2 sheets of .080 in
> plexiglas? Thanks.
>
> Larry

> On Nov 4, 11:09 pm, Larry > wrote:
>> I am planning a "touchy" repair job to my canopy. I've done some test
>> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
>> the ugly bubbles and noticed some fine plexiglas stress cracking on
>> one test piece. Is there another sort of cement (eg. Weld-On #40)
>> which would make for a better looking bond between 2 sheets of .080 in
>> plexiglas? Thanks.
>>
>> Larry
>
> wrote in message
ups.com...
> Wonder how silicone would do? They use it to make home aquariums. I
> use it for holding lots of things - small sheet metal covers for wing
> bolt holes, txpdr antenna metal base to my composite plane.......
> Holds great. And it flexes slightly to help with differential heat
> expansion (your cracking problem?). Just let it cure overnight.

There is a very clear Silicone-like product which I used to install my
windshield. It is packaged in a caulking-gun tube. Someone here must know
it's name. I'll bet it would work well in this application.

Rich S.

"Rich S." > wrote

> There is a very clear Silicone-like product which I used to install my
> windshield. It is packaged in a caulking-gun tube. Someone here must know
> it's name. I'll bet it would work well in this application.


Polyurethane caulk, perhaps?

I have never used it in that application, but I know one thing. That stuff
is sticker than cat ****!

It works like caulk, but holds like construction adhesive.

It might be worth an experiment. (on some sample pieces) After all, this
is experimental aviation, right?
--
Jim in NC

"Morgans" > wrote in message
...
>
> Polyurethane caulk, perhaps?

Nope - that's not it, Jim. It isn't a caulking material at all. I may have a
receipt for it in my records. Seems to me it was in a red tube and, like I
said, it's almost crystal-clear.

Rich

"Rich S."

> Nope - that's not it, Jim. It isn't a caulking material at all. I may have
> a receipt for it in my records. Seems to me it was in a red tube and, like
> I said, it's almost crystal-clear.

OK, but for the record, there is a clear (very clear) polyurethane caulk,
that is very different is consistency from regular caulk.

I hope you can find what it was. I'm always open to learning about new
stuff!
--
Jim in NC

On Nov 4, 10:09 pm, Larry > wrote:
> I am planning a "touchy" repair job to my canopy. I've done some test
> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> the ugly bubbles and noticed some fine plexiglas stress cracking on
> one test piece. Is there another sort of cement (eg. Weld-On #40)
> which would make for a better looking bond between 2 sheets of .080 in
> plexiglas? Thanks.
>
> Larry

Try Shoe Goo.

On Fri, 09 Nov 2007 20:22:24 -0800, wrote:

>On Nov 4, 10:09 pm, Larry > wrote:
>> I am planning a "touchy" repair job to my canopy. I've done some test
>> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
>> the ugly bubbles and noticed some fine plexiglas stress cracking on
>> one test piece. Is there another sort of cement (eg. Weld-On #40)
>> which would make for a better looking bond between 2 sheets of .080 in
>> plexiglas? Thanks.
>>
>> Larry
>
>Try Shoe Goo.

Are you talking about Goop? I use it all the time but don't think it
would hold up in sun for many years.

I fixed a crack in one of my work cars tail lights and it has now
turned a light gray and not transparent.

Big John

On Nov 9, 11:42?pm, Big John > wrote:
> On Fri, 09 Nov 2007 20:22:24 -0800, wrote:
> >On Nov 4, 10:09 pm, Larry > wrote:
> >> I am planning a "touchy" repair job to my canopy. I've done some test
> >> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> >> the ugly bubbles and noticed some fine plexiglas stress cracking on
> >> one test piece. Is there another sort of cement (eg. Weld-On #40)
> >> which would make for a better looking bond between 2 sheets of .080 in
> >> plexiglas? Thanks.
>
> >> Larry
>
> >Try Shoe Goo.
>
> Are you talking about Goop? I use it all the time but don't think it
> would hold up in sun for many years.
>
> I fixed a crack in one of my work cars tail lights and it has now
> turned a light gray and not transparent.
>
> Big John

For unrelated application I bought some 2 part urethane that is
rubbery and very very clear. It also seems to stick to lots of things.
Not sure how well it works with plexiglas. I am planning to use it to
make a 3D "domed label". Very eye appealing. You see it on luggage,
garmin products etc. Looks cool with silver vinyl background and
printed stuff on top. The whole thing is then covered with clear
urethane poured over it.

Larry

See an article in the November 07 issue of EAA Sport Aviation for
description and pictures of a repair. ..... Neal

Larry wrote:

> I am planning a "touchy" repair job to my canopy. I've done some test
> sheet acrylic bondings with acrylic IPS Weld-On (#16). I don't like
> the ugly bubbles and noticed some fine plexiglas stress cracking on
> one test piece. Is there another sort of cement (eg. Weld-On #40)
> which would make for a better looking bond between 2 sheets of .080 in
> plexiglas? Thanks.
>
> Larry
>