sm_jamieson wrote:
I have a window that needs to be properly sorted sometime, but there
is a about 4cm curved crack near the bottom. Is there some
penetrating glue that I can use to fix this crack so it will not run
any further in the near future ? Trying to avoid replacing the pane
for now.
Thanks,
Simon.

Simon,

Use a glass cutter and score a small, short cut across the end[s] of the
crack at right angles to it. That usually stops the crack 'running' long
enough to replace the glass.

Just out of interest, I have even used this method on the laminated
windscreen of a van which lasted around 6 months before I got around to
replacing it.

Cash

"Cash" wrote:
sm_jamieson wrote:
I have a window that needs to be properly sorted sometime, but there
is a about 4cm curved crack near the bottom. Is there some
penetrating glue that I can use to fix this crack so it will not run
any further in the near future ? Trying to avoid replacing the pane
for now.
Thanks,
Simon.

Simon,

Use a glass cutter and score a small, short cut across the end[s] of the
crack at right angles to it. That usually stops the crack 'running' long
enough to replace the glass.

Just out of interest, I have even used this method on the laminated
windscreen of a van which lasted around 6 months before I got around to
replacing it.

Cash

Did you test this with another crack *without* the scoring to see if it
worked? One uncontrolled test doesn't prove much. ;-)

Tim

Tim+ wrote:
"Cash" wrote:
sm_jamieson wrote:
I have a window that needs to be properly sorted sometime, but there
is a about 4cm curved crack near the bottom. Is there some
penetrating glue that I can use to fix this crack so it will not run
any further in the near future ? Trying to avoid replacing the pane
for now.
Thanks,
Simon.

Simon,

Use a glass cutter and score a small, short cut across the end[s] of
the crack at right angles to it. That usually stops the crack
'running' long enough to replace the glass.

Just out of interest, I have even used this method on the laminated
windscreen of a van which lasted around 6 months before I got around
to replacing it.

Cash

Did you test this with another crack *without* the scoring to see if
it worked? One uncontrolled test doesn't prove much. ;-)

Tim

Nope, but some 50+ years of playing with the stuff does, cutting it, fixing
it, breaking it etc - and yes, leave it alone and the crack will 'run', very
often in more than one direction.

Now tell me on what experience of the stuff did you base your response.

Cash

"Cash" wrote:
Tim+ wrote:
"Cash" wrote:
sm_jamieson wrote:
I have a window that needs to be properly sorted sometime, but there
is a about 4cm curved crack near the bottom. Is there some
penetrating glue that I can use to fix this crack so it will not run
any further in the near future ? Trying to avoid replacing the pane
for now.
Thanks,
Simon.

Simon,

Use a glass cutter and score a small, short cut across the end[s] of
the crack at right angles to it. That usually stops the crack
'running' long enough to replace the glass.

Just out of interest, I have even used this method on the laminated
windscreen of a van which lasted around 6 months before I got around
to replacing it.

Cash

Did you test this with another crack *without* the scoring to see if
it worked? One uncontrolled test doesn't prove much. ;-)

Tim

Nope, but some 50+ years of playing with the stuff does, cutting it, fixing
it, breaking it etc - and yes, leave it alone and the crack will 'run', very
often in more than one direction.

What, windscreens or window glass?

I only ask as I based my comment on someone's relation of how they
regularly defrosted their cracked laminated windscreen with hot water
*without* causing the crack to propagate. I suspect laminated glass may
behave differently from single panes.

Tim