Frequently Asked Questions
Click on the question link below or simply scroll down to see detailed answers for the most frequently asked questions by GlassRenu Scratch Removal System users.
If you don’t find the answer to your question below, send us your question and one of our expert glass technicians will respond within two business days.
1) I’ve tried other systems with limited success. What kind of guarantee do I have that GlassRenu actually works?
2) Does GlassRenu work on tempered glass?
3) Does GlassRenu work on car windshields?
4) Does GlassRenu work on mirrors?
5) How deep of a scratch can GlassRenu remove?
6) Can GlassRenu handle large jobs?
7) How does GlassRenu work on scratches from construction, like stucco damage?
8) I am getting light (deep) swirl marks when grinding, what am I doing wrong?
9) Ok, so now I know what I did to put the swirls in, how do I get them out?
10) I just finished repairing some glass and when I look straight through the glass it is clear but as soon as I look through the repaired area at an angle I see a foggy shadow where I was grinding. What am I doing wrong?
FAQ 1: I’ve tried other systems with limited success. What kind of guarantee do I have that GlassRenu actually works?
GlassRenu is unlike any other commercial system on the market anywhere in the world. GlassRenu repairs scratches and acid damage, removes fabrication debris and hard water stains from all types of glass faster, cleaner and at a lower cost per repair without distortion. We stand behind our products by offering the industry’s only Product Performance Guarantee, if your GlassRenu System doesn’t perform as promised, we’ll buy it back within the first 30 days of ownership.
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FAQ 2: Does GlassRenu work on tempered glass?
Yes. The only difference between tempered and traditional glass is that it has been heat treated for strength and safety (it breaks into small pieces). GlassRenu is used extensively on tempered glass in storefronts, home windows and doors and the results are the same as with traditional glass—clarity with no visible distortion.
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FAQ 3: Does GlassRenu work on car windshields?
The GlassRenu System has been used successfully on many different types of windshields on a wide range of vehicles, though the type of damage and shape of the windshield can impact results.
GlassRenu’s polisher is optimized for flat glass and achieves excellent no-distortion results on flatter auto windshields and windows, like those found on buses and trains. Potential limitations to removing damage from auto glass without distortion increase as the glass’ curvature becomes more pronounced. However, GlassRenu’s edger polishing head can generally remove scratches from curved auto glass. For example, one of our users used this method to successfully remove Scotch-Brite scratches from a Bentley windshield without distortion.
Exceptions to this rule are “pitted" or "sandblasted" windshields; this sort of damage usually needs to be replaced.
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FAQ 4: Does GlassRenu work on mirrors?
Yes. A mirror is just a piece of flat glass with a reflective backing.
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FAQ 5: How deep of a scratch can GlassRenu remove?
GlassRenu has never received a report of a deep scratch our systems could not remove. Fairly deep scratches, .004" - .010, are regularly removed with great no-distortion results and we are currently working with the American National Standards Institute (ANSI) to show GlassRenu Systems deliver no-distortion results at .010", .015" and .020".
In addition to deep scratches, GlassRenu Systems have produced no-distortion results repairing graffiti with chipped glass fragments and glass dust throughout the damaged area. This type of deep damage can take more time to repair, and, as a result, users often bill their customers 50 percent of the glass replacement cost, overall savings that make the customer happy.
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FAQ 6: Can GlassRenu handle large jobs?
Yes. One example of a large job completed successfully in the field was a GlassRenu user whose company repaired approximately 600 m2 of concrete damaged scratched glass in 4 weeks, with 4 men and 2 systems. The damaged glass was 4m, laminated and tempered with scratches on both sides from concrete being wiped off. The replacement cost was estimated at € 60.000,00. GlassRenu completed the repairs without distortion for € 26.000,00 a savings of more than 55 percent.
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FAQ 7: How does GlassRenu work on scratches from construction, like stucco damage?
After graffiti vandalism, stucco damage is one of the most common problems encountered by our users in the field. Homebuilders are ecstatic to spend a fraction of what they used to spend to replace damaged glass on a repair and very happy with GlassRenu’s no distortion results. The repairs are made onsite, without having to take the glass out.
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FAQ 8: I am getting light (deep) swirl marks when grinding, what am I doing wrong?
Often, during the first few repairs, new GlassRenu users report producing light concentric circles or swirl marks and don’t know what they are doing wrong. There are two possibilities:
1. The surface of the RenuDisk is not completely flat against the glass during the grinding step. This will usually produce swirl marks that look like overlapping concentric arcs that have an opening on one side. The side of the disk that lifted off during grinding is the side of the circle with the open arc.
2. The RenuDisk is being pressed against the glass with too much force. When this happens, the swirls are complete, overlapping circles. Easing up on the pressure applied to the disk should stop the swirls.
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FAQ 9: Ok, so now I know what I did to put the swirls in, how do I get them out?
A swirl is just a circular scratch. Treat it the same as you would any other scratch you are removing. Just remember you only want to grind the glass until the scratch is gone - no more, no less.
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FAQ 10: I just finished repairing some glass and when I look straight through the glass it is clear but as soon as I look through the repaired area at an angle I see a foggy shadow where I was grinding. What am I doing wrong?
Just as with swirls, there are two things that can cause or contribute to foggy shadows during the repair process:
1. Not enough time was spent with the Pre-Polish disk and, as a result, all traces of grinding were not removed.
2. The glass required additional polishing. So how long is long enough when polishing? That depends on the glass and the size of the repair, but with practice you will soon figure out what it will take to get the glass just right.
A good practice to ensure clear results is to take a dry erase marker and, on the opposite side of the glass, circle and grid-off the area you were grinding. Next work on only one area of the grid until the glass is clear from all angles. This will let you know how long you will need to polish each subsequent area and cut down on the starting and stopping.
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