Anyone seen this in the hatch window?
Thread Starter
Instructor
Joined: Nov 2005
Posts: 125
Likes: 1
From: Tarpley Texas
Anyone seen this in the hatch window?
In certain sunlight at some angles, there looks to be splaches or discoloration in the window represented by round fade type spots. Could this be wear and tear from the defroster?
I plan on tinting the windows but would like to figure out how to deal with this first.
92 Coupe
I plan on tinting the windows but would like to figure out how to deal with this first.
92 Coupe
Thread Starter
Instructor
Joined: Nov 2005
Posts: 125
Likes: 1
From: Tarpley Texas
Originally Posted by Gary6595
Aside from possible physical damage, it's the polarization of the glass.
Melting Slicks
Joined: May 2002
Posts: 3,424
Likes: 1
From: Tucson Az
St. Jude Contributor
Originally Posted by southpaw3519
Looking close, there is no damage. Straight on view it doesn't show nor does it at night unless spotlighted. If it's polarization, I guess I have to live with it or place the hatch?
Burning Brakes
Joined: Oct 2005
Posts: 798
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From: OAKLEY CA
Originally Posted by southpaw3519
Anyone tint the hatch and have this go away or get worse?
On previous cars I've owned I've seen these "spots" also. Someone told me is is caused in the manufacturing process from cold air jets used to cool the glass when it is bonded. This could be an "Urban Myth" though.
Maybe someone who worked at a glass factory could tell us.
Heel & Toe
Joined: Aug 2004
Posts: 23
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From: middle of a corn field state of confusion
the discoloration or spots your seeing is just what happens sometimes when glass is tempered and no it will not get worse. If you look at other cars with polarized sunglasses you will see spots all over the windows.. So see your not the only one seeing spots. 
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Michael S. Palmer
Race Director
Joined: Aug 2002
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From: Stratford Ontario
Originally Posted by rubber duck
the discoloration or spots your seeing is just what happens sometimes when glass is tempered and no it will not get worse. If you look at other cars with polarized sunglasses you will see spots all over the windows.. So see your not the only one seeing spots.
I got freaked out when I got my new shades. 
Le Mans Master
Joined: Dec 2004
Posts: 5,789
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From: Myrtle Beach SC
St. Jude Donor '05-'06
I thought saftey glass was laminated with plastic between 2 layers of glass.Isn't that what it is?I know in the old days back windows were not made of saftey glass that is why if you shoot them with a BB gun they will totally disintergrate and shatter unlike the front window(not that I ever did that).
Team Owner
Joined: Sep 2003
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From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
Originally Posted by dino89vette
Never noticed it on mine. Could it be the affect of acid rain?
Le Mans Master
Joined: Sep 2003
Posts: 5,874
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From: Littleton CO
Originally Posted by rubber duck
the discoloration or spots your seeing is just what happens sometimes when glass is tempered and no it will not get worse. If you look at other cars with polarized sunglasses you will see spots all over the windows.. So see your not the only one seeing spots.
All of my cars have that appearance through my sunglasses. Everyone else's too. It's normal. The effect is much more apparent on curved rear glass - thankfully not on the sides or windshields.
Le Mans Master
Joined: Feb 2005
Posts: 5,146
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From: The Motor City
I would agree, I think the cause is from the factory tint(non-clear glass) my yukon has the same thing. It is only noticable when the car first goes into the sun and when it first gets dark like the sunglasses that change tint for the sun
Last edited by mseven; Feb 10, 2006 at 07:38 AM.
Race Director
Joined: Dec 2002
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by Gary6595
Aside from possible physical damage, it's the polarization of the glass.
But polarized sunglasses will show these spots on many, many cars.
Larry
code5coupe
Le Mans Master
Joined: May 2005
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From: Central Maryland
Originally Posted by Redeasysport
I thought saftey glass was laminated with plastic between 2 layers of glass.Isn't that what it is?I know in the old days back windows were not made of saftey glass that is why if you shoot them with a BB gun they will totally disintergrate and shatter unlike the front window(not that I ever did that).
The remainder of the glass is tempered, so that it will shatter into pebbles and dust, rather than long shards. The pebbles can cause lacerations, but won't impale you and cause deep wounds like long shards of broken, non-tempered glass can do.
Be well,
SJW
