BMW E46 Fanatics Forum banner

1 - 18 of 18 Posts

·
Registered
Joined
·
384 Posts
Discussion Starter #1
I have a lot of stone chip on my fog light lens. Does anybody know how to get it clear again.
I took a bad advice from somebody by using a fine steel wool to take the roughness off. It got worse and dull now :banghead:
 

·
Registered
Joined
·
58 Posts
Hard to believe this hasn't been answered in over a year. I just did this to my headlight lenses, but the fog light lenses are made of the same material so the same method will work for both. Actually, I have the rectangular style fog light lenses. I've never handled the round ones in person so I don't know exactly what they are like.

First take the fog light out and remove the bulb from the lens. Your owners manual will tell you how to do that. It'll be much easier than try to do this while it's on your car.

Start with medium grit sandpaper. I used 600 grit. You might be able to use something more coarse. Sand the lens until there are no more pits. As you sand the surface of the lens will become an opaque whiteish color. This is normal. Make sure this opaque whiteish color is pretty uniform across the whole lens before you move on to the next step.

Next, wet sand with 1200 grit wet/dry sand paper. After you've gone over the whole surface a few times with that do the same thing with 2000 grit wet/dry sand paper. Keeping the surface wet while you sand is important to getting it as smooth as possible. After this the lens still won't be perfectly clear but it will start looking better.

Finally to get the lens perfectly clear and like new, polish with a plastic polish like Meguiars PlasticX or something similar. It's a long process but it's worth it.
 

·
Registered
Joined
·
688 Posts
beluv said:
Hard to believe this hasn't been answered in over a year. I just did this to my headlight lenses, but the fog light lenses are made of the same material so the same method will work for both. Actually, I have the rectangular style fog light lenses. I've never handled the round ones in person so I don't know exactly what they are like.

First take the fog light out and remove the bulb from the lens. Your owners manual will tell you how to do that. It'll be much easier than try to do this while it's on your car.

Start with medium grit sandpaper. I used 600 grit. You might be able to use something more coarse. Sand the lens until there are no more pits. As you sand the surface of the lens will become an opaque whiteish color. This is normal. Make sure this opaque whiteish color is pretty uniform across the whole lens before you move on to the next step.

Next, wet sand with 1200 grit wet/dry sand paper. After you've gone over the whole surface a few times with that do the same thing with 2000 grit wet/dry sand paper. Keeping the surface wet while you sand is important to getting it as smooth as possible. After this the lens still won't be perfectly clear but it will start looking better.

Finally to get the lens perfectly clear and like new, polish with a plastic polish like Meguiars PlasticX or something similar. It's a long process but it's worth it.
Great post, that is the same steps that I'd suggest. You may not have to start as aggressive as 600 grit. Your headlights will come out great ;)

George
 

·
Banned
Joined
·
238 Posts
Beluv... great write-up. :)
 

·
Registered
Joined
·
31 Posts
Did you guys actually try this? Does it work on GLASS fog light lenses? The
E46 Fogs have glass lenses I think...
 

·
Registered
Joined
·
71 Posts
Don't mean to bring this thread back from the dead, but I did the same thing this weekend but started with 400 grit, then 600, then 1200, then plastic polish (Scratch x)... They are like new again (YAY!!!) Definately recommended to get rid of the tarnished yellow lense look. Now I want HID fogs!!! Or CCFL's for the Fogs?
 

·
Registered
Joined
·
1,669 Posts
no e46 have plastic, e36 had glass :thumbup: .. i did it to my fogs, my friends gti, came out great!
can anyone answer this cause I'm curious. My fog lights definitely feel like glass. They have a lot of chips in them and they don't look as clear as my headlights. Can I use this technique to clean them also.
 

·
Registered
Joined
·
26,609 Posts
i think it depends on what kind of fog light you have. I think the round ones ARE glass though. and the rectangular ones are plastic.

dont quote me though.
 

·
Registered
Joined
·
102 Posts
Reviving this long dead thread. As our E46s age, so goes our fog lights. I have now replaced my lamps to DEPO. DEPO lens are plastic. And they are not like the real lamps. So now, I have to go back and retrieve my original lamps. I have been dwelling on this a long time before I replace to DEPO. How to polish road rash/chips for the the round/oblong fog lamps. Yes, they are glass for the ZHPs. Don't know about M3s.

Thanks for the thread. Time to get the various grits of wet/dry sandpapers.
 

·
Premium Member
2003 330cic, 2003 325iT
Joined
·
3,915 Posts
Reviving thread again. One of my fog lights broke when a box fell off a truck ahead of me. The replacement looked awesome and made my unbroken one look terrible.

I unscrewed it and took it to my local detailer - $25 and it looks like new. Way better than hours spent sanding!
 
1 - 18 of 18 Posts
Top