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bhughes(at)qnsi.net
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 Posted: Mon Apr 07, 2008 8:06 am Post subject: Windscreen Crazing |
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Yesterday I decided to remove the protective coverings from all my windows. The inside had the factory plastic coating still in place and the outside had been covered with spraylat after installation of the windscreen. I think the spraylat was applied in August 2006. Plane was moved to the hanger via a wrecker in December 2006.
We used the lancair method and materials to glue in all of the windows. Hysol mixed with flox. Only the windscreen has any signs of crazing. We glued a lancair ES, Mark Ritters RV10 and mine within a few months of each other. The ES is flying with no problems and Mark's plane did not have any cracks using this method. Acetone was used on the glue seam and frame but none touched any other part of the glass.
Any ideas?
Bobby J Hughes
40116
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Tim Olson
Joined: 25 Jan 2007
Posts: 2879
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| Posted: Mon Apr 07, 2008 9:04 am Post subject: Windscreen Crazing |
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All I can wonder is....yeah, you say they were sprayed within a
few months of each other, but, is the spraylat something you had
to mix up in batches? It seems that maybe there was some chemical
that attacked the windshield that must have come from the
spraylat, or perhaps some cleaner that was used just prior to
spraying it on. That crazing almost HAD to be chemical...not
sun or anything else...so you need to know exactly what was
put on that plexi since it was first opened.....every cleaning
agent, solvent, or anything. I'd wonder about using approved
products, like Plexus, if they're aerosol and you didn't get it
nice and dry and ventilated before the spraylat was applied.
For those who haven't heard....use Kerosene if you need to remove
stuff off the plexi....not other stuff.
Tim Olson - RV-10 N104CD - Flying
Bobby J. Hughes wrote:
| Quote: | Yesterday I decided to remove the protective coverings from all my
windows. The inside had the factory plastic coating still in place and
the outside had been covered with spraylat after installation of the
windscreen. I think the spraylat was applied in August 2006. Plane was
moved to the hanger via a wrecker in December 2006.
We used the lancair method and materials to glue in all of the
windows. Hysol mixed with flox. Only the windscreen has any signs of
crazing. We glued a lancair ES, Mark Ritters RV10 and mine within a few
months of each other. The ES is flying with no problems and Mark's plane
did not have any cracks using this method. Acetone was used on the glue
seam and frame but none touched any other part of the glass.
Any ideas?
*Bobby J Hughes*
40116
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bhughes(at)qnsi.net
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| Posted: Mon Apr 07, 2008 9:26 am Post subject: Windscreen Crazing |
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No cleaning was done and the spraylat was actually applied with a new
paintbrush a couple of weeks after the windscreen was installed. All
three planes had the windscreens installed within a few months of each
other. I used Mark Ritter's leftover spraylat so it should not have
caused the problem.
Bobby
(One step forward and two steps back)
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indigoonlatigo(at)msn.com
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| Posted: Mon Apr 07, 2008 10:07 am Post subject: Windscreen Crazing |
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I thought it was denatured alcohol. Kerosene leaves a oil layer I thought.
[quote] Date: Mon, 7 Apr 2008 12:01:32 -0500
From: Tim(at)MyRV10.com
To: rv10-list(at)matronics.com
Subject: Re: Windscreen Crazing
--> RV10-List message posted by: Tim Olson <Tim(at)myrv10.com>
All I can wonder is....yeah, you say they were sprayed within a
few months of each other, but, is the spraylat something you had
to mix up in batches? It seems that maybe there was some chemical
that attacked the windshield that must have come from the
spraylat, or perhaps some cleaner that was used just prior to
spraying it on. That crazing almost HAD to be chemical...not
sun or anything else...so you need to know exactly what was
put on that plexi since it was first opened.....every cleaning
agent, solvent, or anything. I'd wonder about using approved
products, like Plexus, if they're aerosol and you didn't get it
nice and dry and ventilated before the spraylat was applied.
For those who haven't heard....use Kerosene if you need to remove
stuff off the plexi....not other stuff.
Tim Olson - RV-10 N104CD - Flying
Bobby J. Hughes wrote:
> Yesterday I decided to remove the protective coverings from all my
> windows. The inside had the factory plastic coating still in place and
> the outside had been covered with spraylat after installation of the
> windscreen. I think the spraylat was applied in August 2006. Plane was
> moved to the hanger via a wrecker in December 2006.
>
> We used the lancair method and materials to glue in all of the
> windows. Hysol mixed with flox. Only the windscreen has any signs of
> crazing. We glued a lancair ES, Mark Ritters RV10 and mine within a few
> months of each other. The ES is flying with no problems and Mark's plane
> did not have any cracks using this method. Acetone was used on the glue
> seam and frame but none touched any other part of the glass.
>
> Any ideas?
>
> *Bobby===========
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n223rv(at)wolflakeairport
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| Posted: Sun Apr 13, 2008 10:02 am Post subject: Windscreen Crazing |
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I had a similar issue with crazing that occurred under a tape line that I used to mask off the top of the fiberglass edge at the base of the windscreen. After replacing the windshield, I did a bunch of tests on the old windscreen to see what would make it craze. I was able to get cracks and crazing using the Van's recommended Weld-On when under pressure (not a lot of pressure, but some pressure). I decided to switch on my second install to Sika-Flex. I pooled acetone on the window until it evaporated, no crazing. I then took the Sika-Flex primer and applied it and let it air dry for a few minutes (not fully cured, but dry to the touch). Then when I sprayed it with acetone, it disintegrated the primer and proceeded to craze the windshield in that area... Looks just like your window did.
I then took a fresh section, applied the primer and let it dry overnight. I then sprayed it with the acetone and it would not remove the primer and it did not craze the windscreen. I played around with it again and if I sprayed the acetone before the primer was dry, it would craze the window every time.
There clearly was some reaction with the Sika-Flex primer and acetone while the primer was not fully cured. This never explained why my RV-10 windscreen crazed, but I have come to the conclusion to not use acetone on my windscreen (even though others have used it for years with 'no issues').
FYI, for removing the windscreen I took a router and set the depth to the window thickness and routed around the edges where it was adhered. It made a big mess, but it sure did a nice job and left a nice surface to glue the new windshield to....
-Mike Kraus
RV-4 Flying
RV-10 FWF and wiring
[quote]
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bhughes(at)qnsi.net
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| Posted: Mon Apr 14, 2008 5:57 am Post subject: Windscreen Crazing |
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Mike,
Now that SNF is over I am waiting to hear from the windshield folks. How long did it take for the crazing to start \ stop during your various tests? Did it progress over time? Not sure what method I will use this time but I may try the Sika-Flex or use the Hysol and flox method again.
Thanks,
Bobby
40116
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Mike Kraus
Sent: Sunday, April 13, 2008 11:59 AM
To: rv10-list(at)matronics.com
Subject: RE: Windscreen Crazing
I had a similar issue with crazing that occurred under a tape line that I used to mask off the top of the fiberglass edge at the base of the windscreen. After replacing the windshield, I did a bunch of tests on the old windscreen to see what would make it craze. I was able to get cracks and crazing using the Van's recommended Weld-On when under pressure (not a lot of pressure, but some pressure). I decided to switch on my second install to Sika-Flex. I pooled acetone on the window until it evaporated, no crazing. I then took the Sika-Flex primer and applied it and let it air dry for a few minutes (not fully cured, but dry to the touch). Then when I sprayed it with acetone, it disintegrated the primer and proceeded to craze the windshield in that area... Looks just like your window did.
I then took a fresh section, applied the primer and let it dry overnight. I then sprayed it with the acetone and it would not remove the primer and it did not craze the windscreen. I played around with it again and if I sprayed the acetone before the primer was dry, it would craze the window every time.
There clearly was some reaction with the Sika-Flex primer and acetone while the primer was not fully cured. This never explained why my RV-10 windscreen crazed, but I have come to the conclusion to not use acetone on my windscreen (even though others have used it for years with 'no issues').
FYI, for removing the windscreen I took a router and set the depth to the window thickness and routed around the edges where it was adhered. It made a big mess, but it sure did a nice job and left a nice surface to glue the new windshield to....
-Mike Kraus
RV-4 Flying
RV-10 FWF and wiring
[quote]
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