Polishing Hella glass fog lights
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Polishing Hella glass fog lights
So, I figured I would try to sand out the pitting on my fogs instead of dropping over $120 on a new set. Finding ones that are the larger and longer in size has been quite an issue, and even with the part number I thought was correct, I ordered the shorter ones by mistake.
Here is a step by step process with photos on what I did. Please make sure you wear a mask since sanding glass is not healthy at all!
Original Condition: 1. Sanded with 40 grit for about 15 mins on each changing the paper frequently. You have to watch and alternate between each light so they can cool down since too much heat causes them to crack. 2. Worked my way up from 40 grit to 60 grit, then 80...then 120...then 200...then 320.
3. After 320, I took them on my buffing wheel with the black compound and polished until smooth. Have to watch the heat here too! 4. After the polishing wheel, I used 3M Glass Polish with the small pads on my orbital buffer.
Here is a step by step process with photos on what I did. Please make sure you wear a mask since sanding glass is not healthy at all!
Original Condition: 1. Sanded with 40 grit for about 15 mins on each changing the paper frequently. You have to watch and alternate between each light so they can cool down since too much heat causes them to crack. 2. Worked my way up from 40 grit to 60 grit, then 80...then 120...then 200...then 320.
3. After 320, I took them on my buffing wheel with the black compound and polished until smooth. Have to watch the heat here too! 4. After the polishing wheel, I used 3M Glass Polish with the small pads on my orbital buffer.
Re: Polishing Hella glass fog lights
You can see, some of the pitting is still there, but these were pretty bad! I am very happy with the way the turned out. I was ready to throw them out, but I am glad that I tried this method since I really didn't have nothing to loose. The whole process took about 3.5 hours.
Hope this helps and have fun!
- zinnocoupe
- Posts: 506
- Joined: Fri Sep 19, 2014 12:57 am
- Location: Vancouver BC
Re: Polishing Hella glass fog lights
That looks pretty good. 40 is pretty coarse, do you think you could start with something less aggressive and still achieve the same result? I've got set thats pretty pitted as well and have been thinking about this. Nice work
Re: Polishing Hella glass fog lights
It is, but I actually tried starting at 80 on a spare that was just as bad, but that did nothing for the deeper pitting. I then moved down to 60 and still not any better. It will all depend on yours, but as they say, start with less aggressive first and if that doesn't get you a result, you can always move to a more aggressive grit.zinnocoupe wrote: ↑Mon Sep 11, 2017 3:12 am That looks pretty good. 40 is pretty coarse, do you think you could start with something less aggressive and still achieve the same result? I've got set thats pretty pitted as well and have been thinking about this. Nice work
- hornhospital
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Re: Polishing Hella glass fog lights
What kind of sander were you using? Obviously you can't hand sand the lights with sufficient vigor to get them hot.
I wonder if it's the heat from sanding that cracks them, or the sanding itself? Those lights get finger-blistering hot in use. I cannot see how sanding them could generate more heat than the Halogen bulb does.
I wonder if it's the heat from sanding that cracks them, or the sanding itself? Those lights get finger-blistering hot in use. I cannot see how sanding them could generate more heat than the Halogen bulb does.
Ken Kanne
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
'84 633CSi "Sylvia"; '85 635CSi "Katja";'85 325e "Hazel Ann"; '95 M3 "Ashlyn"
Re: Polishing Hella glass fog lights
I used a 5" random orbital. I was just trying to be careful not to crack them. Either way, I was just cautious.hornhospital wrote: ↑Mon Sep 11, 2017 5:50 pm What kind of sander were you using? Obviously you can't hand sand the lights with sufficient vigor to get them hot.
I wonder if it's the heat from sanding that cracks them, or the sanding itself? Those lights get finger-blistering hot in use. I cannot see how sanding them could generate more heat than the Halogen bulb does.
Re: Polishing Hella glass fog lights
What type (mfger, material) sandpaper did you use?
Do you think wet sanding would take less time or otherwise have an advantage?
Do you think wet sanding would take less time or otherwise have an advantage?
"Sabine": '88 M6 Royalblau/Silber
SLS delete, Wizard Cooling radiator, BavAuto Strut bar, M-Technik steering wheel, Conforti chip, Bilstein B8s / H&R Lowering Springs, BBE stainless cat-back exhaust
SLS delete, Wizard Cooling radiator, BavAuto Strut bar, M-Technik steering wheel, Conforti chip, Bilstein B8s / H&R Lowering Springs, BBE stainless cat-back exhaust
Re: Polishing Hella glass fog lights
Nice work. I had no idea you could sand and polish glass. Mine were also quite pitted, but I took the easy route and covered them with vinyl film, which also allowed me to change the color to yellow:
I also used some clear flim to protect the new Hella BiFocus low beams (the right one is filmed, the left bare):
I also used some clear flim to protect the new Hella BiFocus low beams (the right one is filmed, the left bare):
Dean
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
Re: Polishing Hella glass fog lights
Looks great Dean! What was the actual product that you used?
As for the question of wet sanding, I didn't try and the sandpaper I used was just the Gator brand I found at Lowes. Through each grit, I went through about 3-4 pads per.
As for the question of wet sanding, I didn't try and the sandpaper I used was just the Gator brand I found at Lowes. Through each grit, I went through about 3-4 pads per.
Re: Polishing Hella glass fog lights
I was just reading a how-to manual on autoglass repair including polishing. I think the 3M product you used is cerium oxide powder which can be mixed with water to a slurry and used with either a DA or orbital polisher.
--Ken
--Ken
Sansouci
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)
84 E24 633Csi Auto, Bronzit/PearlBeige 6997510
93 E32 740il M60 Auto, Alpenweis/Ultramarine
60 528i M30 5-speed Green/Beige (crushed)
71 240Z 4-speed White/Blue (rusty & sold)
65 396 Chevelle 4-speed, Marina Blue/Black (stolen)
Re: Polishing Hella glass fog lights
This is what I used on the fogs, and I applied two layers to get the color density I wanted:
https://www.amazon.com/inches-Adhesive- ... +tint+film
And, on the headlights:
https://www.amazon.com/iJDMTOY-12-48-in ... light+film
Application is fairly simple, and there will be plenty extra in case you screw up the first time, and you'll need a heat gun. A credit card works fine as a squeegee.
https://www.amazon.com/inches-Adhesive- ... +tint+film
And, on the headlights:
https://www.amazon.com/iJDMTOY-12-48-in ... light+film
Application is fairly simple, and there will be plenty extra in case you screw up the first time, and you'll need a heat gun. A credit card works fine as a squeegee.
Dean
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
- zinnocoupe
- Posts: 506
- Joined: Fri Sep 19, 2014 12:57 am
- Location: Vancouver BC
Re: Polishing Hella glass fog lights
Those yellow fogs really look good Dean. I have some yellow glass paint I was going to paint a second set of fogs with, but I like the idea of the film better.
Re: Polishing Hella glass fog lights
Daniel Tern has instructions for making yellow fogs using transparent yellow spray paint, but I think the film is both easier to apply and more durable. I'd like to think it offers some protection, which is why I filmed the brand new headlights, but the stuff I used is not nearly as thick as the 3M, and other, films made specifically for that.
Dean
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z
Lutz, FL
'85 635 CSi Euro #9402254
'87 Spider Veloce
'92 Spider Veloce
'08 350Z