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Clay Bars on windscreens.
https://www.ausmini.com/forums/viewtopic.php?f=2&t=76856		 Page 1 of 3
Author:  Poorboy_Racer [ Mon May 21, 2012 5:28 pm ]
Post subject:  Clay Bars on windscreens.
Anyone else experienced this?
Some time ago I was going to a show and thought the windscreen was a bit crazed. So I used a clay bar on it. Read lot of post on other forums about using clay bars. Brought the screen up a treat very clear. Went to the show but as soon as I got to over 100kph the screen shattered. I put a post up on another forum and was persuaded that it must have been a coincidence. This was approx 3 years ago. The screen was replaced with a second had screen. This weekend was the English car show in Gingin (great show buy the way). I thought I will give that clay bar another go. Same thing happened Image I have had the car a long time and only ever had two broken windscreens both times immediately after using a clay bar. Never going to use one on glass anymore. Put another post up on the original web site and most responses are still couldn’t be the clay bar, but it’s too much of a coincidence. I have had to replace it with the screen destined for my ute. Not happy about the new scratches on my bonnet.
Author:  willy [ Mon May 21, 2012 5:38 pm ]
Post subject: 
Very interesting indeed!
But I don't draw any correlation between a clay-bar causing any reason for the windscreen to shatter.
Author:  coopar [ Mon May 21, 2012 5:40 pm ]
Post subject: 
Were you throwing the clay bar at the windscreen?
Author:  Beanie [ Mon May 21, 2012 5:42 pm ]
Post subject: 
is the clay expandind as the find passes over it ( the slay that fills the small pits in the window ..)

thats all i can think of ..

Beanie
Author:  Beanie [ Mon May 21, 2012 5:43 pm ]
Post subject: 
coopar wrote:
Were you throwing the clay bar at the windscreen?



:lol:

HAHAHAHA love it
Author:  Poorboy_Racer [ Mon May 21, 2012 5:46 pm ]
Post subject: 
Quote:
Were you throwing the clay bar at the windscreen?


:) No but I did feel like throwing the bloody thing away after my second screen shattered
Author:  adamstuart [ Mon May 21, 2012 6:44 pm ]
Post subject: 
Not sure about your clay bar hokum, but I clean windscreens with a razor blade and some thinners

You'd be amazed how much tar and crap comes off what was a "Clear" windscreen.

Best to do if the screen is out of the car though, or very carefully in the car ;)
Author:  drmini in aust [ Mon May 21, 2012 7:15 pm ]
Post subject: 
It's because it is a toughened (not laminated) screen. Used on all Oz Minis except Cooper S (and maybe GT) which were laminated.
The surface of the glass in a toughened screen is in compression, when you clay bar it the surface stress is released, so tinkle tinkle.
You shouldn't even polish marks out of these screens with glass polish I've been told.
Get a new laminated one... :wink:
Author:  Poorboy_Racer [ Mon May 21, 2012 7:41 pm ]
Post subject: 
Thank you Dr Mini That makes perfect sence.
Author:  Aussie Brian [ Mon May 21, 2012 9:24 pm ]
Post subject: 
My screen has some annoying scratches in it, maybe it is time for me to get out the clay bar :lol: :lol: :lol:
Author:  drmini in aust [ Mon May 21, 2012 9:44 pm ]
Post subject: 
Aussie Brian wrote:
My screen has some annoying scratches in it, maybe it is time for me to get out the clay bar :lol: :lol: :lol:

Amen, brother. :P
Author:  haze blue 850 [ Mon May 21, 2012 10:15 pm ]
Post subject: 
Gotta agree with drmini.
Toughened glass is heated just under melting point and travels through cooling chamber which creates "surface tention" on the outside surfaces. If you look hard, safety glass usually will have two pinch marks where the clamps grab the hot glass to carry it through the cooling chamber.
If you wet n dry a small spot, it will eventually burst.
Some manufacturers cooled the glass slower at drivers zone so it didn't shatter as small as the rest of the screen, leaving a small section with slightly bigger peices you could see through while standing on ya brakes!

I prefer the safety glass (toughened) type. Harder glass, easier to fit.
However, ADR's now prefer laminated.

Instant windscreens were by far the cheapest when I last bougt one. O'B's were more than twice the price.

Cheers
Alex.
Author:  haze blue 850 [ Mon May 21, 2012 10:15 pm ]
Post subject: 
Pushed the button twice Ooooop's
Author:  drmini in aust [ Mon May 21, 2012 10:27 pm ]
Post subject: 
Back before we all got seat belts by law (1965?), toughened glass was far safer for the occupants.
You could get ejected through it, which was safer than punching your head against or through! :shock: a laminated one. Head through a laminated (Triplex) would kill you (2 plate glass layers on a plastic substrate).
Author:  Wombat [ Tue May 22, 2012 8:17 am ]
Post subject: 
drmini in aust wrote:
Back before we all got seat belts by law (1965?), toughened glass was far safer for the occupants.
You could get ejected through it, which was safer than punching your head against or through! :shock: a laminated one. Head through a laminated (Triplex) would kill you (2 plate glass layers on a plastic substrate).


The necklace of death - used to promote the wearing of seatbelts when first introduced. As the head went though the screen the a circle of jagged shards were pushed out with it then when the body collapsed back into the car the shard points came in around the base of the skull and under the chin - not pretty :shock:
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