fireballbob
Club Regular
Posts: 123
Primary Vehicle: RAV4
Year: 2011
Model Spec/Trim: 4.3.5
Engine Capacity: 2.2
Fuel Type: Diesel
Transmission: Manual
Drive Type: 4WD/AWD
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Post by fireballbob on Dec 17, 2018 20:15:04 GMT
Hi all.
i thought the horrible noise was ice when my wipers started but unfortunately it wasn't. two small bits of grit have caused two arcs across my screen. not noticeable in the dark but when the sun comes out they are quite visible. i can't feel them with my fingernails so i wonder if there is a chance they may be polished out. any views or help would be appreciated.
Cheers
Bob
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Post by clarki on Dec 17, 2018 20:27:17 GMT
Many people recon jewelers rouge or cerium oxide powder (what we used on my mates golf) is the stuff to go for (you can get it from amazon, etc).
Search youtube. There's plenty of howtos. You are not alone.
You'll need a half decent da polisher. Don't waste you time going to autoglass, etc they'll just tell you it weakens the glass, blah, blah, blah.
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Post by unclebob on Dec 17, 2018 20:33:22 GMT
I’ve used jewelers rouge on a windscreen scratch years ago..It done the job but was very hard work to get the desired result 👍🏻👍🏻
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Post by three5 on Dec 20, 2018 19:25:48 GMT
Many years ago I worked for a major UK manufacturer of windscreens. Toughened glass is an interesting material as the outside "skins" ( about 0.02" each side ) are in compression and the centre "layer" is in tension. 20 thou would take a serious amount polishing to get through and anything that smooths the edges of the depression ( the scratch ) will only make the likelihood of a crack developing less, i.e it reduced or removes the stress raiser. If I were doing the job, I'd use a cotton buffing wheel, as used for polishing metal, ideally on a die grinder but otherwise on an electric drill. I think that you may be able to get a very small version of these wheels for a Dremel which would be much more controlable. You should get away with ( as Bob says ) jewellers rouge which would be a lot cheaper than diamond paste. ( - I only use that on watch glasses! ) SHCM had a similar problem a few years ago if I remember correctly.
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Post by shcm on Dec 21, 2018 18:17:54 GMT
SHCM had a similar problem a few years ago if I remember correctly.
...and I'm quite sure mine was caused by something being blown onto the screen on an EXTREMELY windy and wet night.
The man above would know far more than me, but after trying, I'm not convinced it would have polished out and it too was only viewable in certain light angles. No idea of the scratch depth (you could detect it by touch). My advice, bite the unfortunate bullet and just get the screen changed.
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Post by charliefarlie on Dec 21, 2018 19:22:14 GMT
Don’t forget guys that Cerium Oxide comes in varying grades of cut. So before you bin a screen have a go at cutting with a good heavy grade. You have nowt to loose. Oh and a rotary machine is required or you will never get anywhere.
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