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  1. #1
    Director of Training Mike Phillips's Avatar
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    Glass polishing - How to remove scratches in glass

    Glass polishing - How to remove scratches in glass


    In the picture below you will see the pads, products and tools you need to remove scratches from glass.

    Glass is very hard and in order to abrade it in a way to remove scratches without at the same time instilling scratches you need a polish specifically made for glass that contain

    Cerium Oxide






    Step-by-Step How to remove scratches in glass


    IMPORTANT
    Never start by working on the glass in front of the driver field of view. Just in case something goes wrong you don't want to impair the view of the driver.


    Step 1: Wash and dry or wipe glass clean.

    Step 2: Tape-off and cover any perimeter window gaskets, wiper arm assemblies, surrounding plastic or trim. Anything you do not want to stain with polish splatter.

    Step 3: Apply some CarPro Ceriglass glass polish directly onto the face of a CarPro Rayon glass polishing pad.

    Step 4: Place the face of the glass polishing pad against the glass and then using a slow speed setting, turn the polisher on and spread the polish out to small area. When buffing out a car windshield, divide the windshield into quarters and work one quarter at a time.

    Step 5: After you have spread the product out at a low speed setting, turn the speed up to a fast speed setting on a dual action polisher like the Porter Cable 7424XP or a low to medium speed setting on a rotary buffer.

    Step 6: Make SLOW overlapping passes with firm pressure. Have a spray bottle of water on hand to re-wet the abrasives as the polish will tend to dry out as you work it. You can get more buffing time from the abrasives by re-wetting them with water.


    Buff till you have removed the scratches to your expectations then repeat to a new section till the entire window is free from scratches.

    Glass polishing can be very messy because the polish will tend to splatter. You can reduce the amount of splatter by using a water sprayer that does a good job of atomizing the water into a fine mist versus an generic spray bottle that squirts water.



    Order List


    Griots Garage 6 Inch Random Orbital Polisher

    5" Dual-Action Hook & Loop Flexible Backing Plate

    Griots Garage 3 inch HD Backing Plate

    3 Inch Dual Action Flexible Backing Plate



    FLEX PE14-2-150 Rotary Polisher

    5" Flex-Foam HD Rotary Backing Plate

    3" Flex-Foam HD Rotary Backing Plate



    5" CarPro Rayon Glass Polishing Pad - 2 Pack

    3" CarPro Rayon Glass Polishing Pad - 2 Pack



    CarPro Ceriglass Glass Polish - 150 ml

    CarPro Ceriglass Glass Polish - 500 ml


    My comment....
    You can remove scratches out of glass using either a rotary buffer or a dual action polisher like the Porter Cable type. With the dual action polisher it will take a little longer but in my opinion the glass polishing process is easier on you when using a dual action polisher versus using a rotary buffer.


    Slow process
    Figure on taking 2-3 hours to machine polish and remove the scratches out of the average size windshield. Longer if you're new to this type of polishing.


    Mike Phillips
    Director of Training Autogeek & Marine 31
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  3. #2
    Senior Member Tato's Avatar
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    Re: Glass polishing - How to remove scratches in glass

    Awesome! Argentina put you in a good mood, but now you should come to Brazil! We are jealous (very!).

    For the first time in history Argentina is ahead Brazil in something. (please, for who does not understood, this is some kind of 'south american joke' between countries)!. I hope you had a very good time there.

    Some time ago I've read that polishing the glass with those abrasives may cause some kind of visual distortion.

    Is it true, partially true, and what's needed to avoid removing scratches but adding distortion?

    I really need to add this glass polishing method to my detailing cart, any input will be great.

    Thanks for sharing,

    Kind Regards.
    “Nature is pleased with simplicity. And nature is no dummy”

    ― Isaac Newton

  4. #3
    Senior Member Mike@DedicatedPerfection's Avatar
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    Re: Glass polishing - How to remove scratches in glass

    Thanks for the article Mike!

    I will keep this in mind as I have some glass to polish now with my new PE14.


  5. #4
    Senior Member Kamakaz1961's Avatar
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    Re: Glass polishing - How to remove scratches in glass

    Thank you Mike! Very informative! I am placing an order from your thread. To save an argument on pads I ordered the 3 " as well as the 5". I have backing plates for both. Again, thank you so much for the information. I will keep the products in my arsenal as you never know when you will need it. AGO is great!! Additionally,the products you have said to get are very reasonably priced on AGO!

  6. #5
    Senior Member Angus's Avatar
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    Re: Glass polishing - How to remove scratches in glass

    Wow! What timing!! I was working on my DD's windshield last night for the first time using CeriGlass, Carpro's Rayon Glass 5" pad, with my GG DA. What a laborious process!

    Quote Originally Posted by Mike.Phillips@Autogeek View Post

    Glass polishing can be very messy because the polish will tend to splatter. You can reduce the amount of splatter by using a water sprayer that does a good job of atomizing the water into a fine mist versus an generic spray bottle that squirts water.
    Mike, can you say more about when to add more CeriGlass vs knowing when the product needs re-wetting? How it should appear/what to look for?

    I found the biggest challenge last night was trying to maintain a "slurry" consistency while trying to hold the GG on speed 6 in one hand with the spray bottle filled with water in the other. CeriGlass drys quick!!

    Also, what do you think are realistic expectations for CeriGlass to remove scratches? If you can catch the scratch with a finger nail is it too deep?

  7. #6
    Director of Training Mike Phillips's Avatar
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    Re: Glass polishing - How to remove scratches in glass

    Quote Originally Posted by Angus View Post

    Mike, can you say more about when to add more CeriGlass vs knowing when the product needs re-wetting? How it should appear/what to look for?
    I don't have any specific scientific method of knowing, I usually mist the section I'm buffing with water and buff a good while before adding more or fresh product.

    Figure on doing 4-5 section passes, mist on some water. Then do 4-5 section passes and mist on some water, then do 4-5 section passes and mist on some water, then do 4-5 section passes and mist on some water and sometime about now you're going to want to add some fresh product.



    Quote Originally Posted by Angus View Post

    I found the biggest challenge last night was trying to maintain a "slurry" consistency while trying to hold the GG on speed 6 in one hand with the spray bottle filled with water in the other. Ceriglass drys quick!!

    The Buddy System

    I teach using the "Buddy System" in my detailing boot camp classes. That is have a buddy or even your better half standing next to you and when they see the glass polish slurry drying they know to mist on some more water.

    Here's the Buddy System in action...






    Quote Originally Posted by Angus View Post

    Also, what do you think are realistic expectations for Ceriglass to remove scratches? If you can catch the scratch with a finger nail is it too deep?
    I've removed some pretty bad scratching, it's just a matter of more time buffing.

    From another article I wrote on this topic, while these wiper scratches are not deep individual scratches like you normally think of a "single scratch", they were very deep and you could easily feel them with your finger, especially on the driver's side. But NOTE where I started and that was on the passenger side.

    NEVER START ON THE GLASS IN FRONT OF THE DRIVER
    (Just in case something goes wrong)



    Here's a little Tape-Line Before and After I did to a Honda windshield that's parked outside all the time.

    This windshield is extremely scratched over time from beach sand being dragged across it from the wipers. This is common to cars in coastal areas.








    These are deep scratches in a 2004 Honda that has spent it's entire life parked outside in Stuart, Florida.




    Here's the same windshield and the same exact location as above...






    Mike Phillips
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    Re: Glass polishing - How to remove scratches in glass

    Mike, do windshields have any sort of protective coating thats going to be removed and should be replaced? I'm thinking of headlights, where most have some sort of UV coating from the factory, and after polishing them you need to seal them to keep them from rapidly deteriorating again. Do windshields also need to be sealed like this?

    I know there are various water repelling agents that can be applied (RainX, while a terrible quality product, comes to mind), but I would think of those as sort of optional enhancers, rather than something necessary. I'm about to polish my windshield (some wiper scratches and micro pits to remove) and have been wondering if I need to purchase a sealer.

  9. #8
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    Mike,

    I really admire all your hard work and guidance.

    Would this also work where someone keyed my passenger window?

    Ronan

  10. #9
    Director of Training Mike Phillips's Avatar
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    Re: Glass polishing - How to remove scratches in glass

    Quote Originally Posted by Romach View Post
    Mike,

    I really admire all your hard work and guidance.

    Would this also work where someone keyed my passenger window?

    Ronan

    I always say,

    "Sometimes you can't completley remove a scratch but you can often time improve a scratch"


    If it's real deep you probably cannot remove it 100%.


    Maybe look into getting the glass replaced?


    Gotta love "people".


    Mike Phillips
    Director of Training Autogeek & Marine 31
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  11. #10
    Senior Member Angus's Avatar
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    Re: Glass polishing - How to remove scratches in glass

    Thanks, Mike! I can really see how a small misting bottle vs a 32oz spray bottle is an important detail not to be over looked. As fatigue started setting in last night, I was loosing product running down the glass from over spraying water. Using a bottle only capable of a quick spritz would have helped with slurry control.

    A while ago Swanicyouth posted an excellent review on using the CeriGlass/CarPro glass pad combo. One of the points he stressed was using plenty of water during the process. Last night I read and re-read his tips while striving for the perfect water to product balance. Next time I'm using a misting bottle.

    Thanks again, Mike (and Swanic)!

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