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Sanding foggy lights....blemish marks remain #4494636
08/21/17 05:27 PM
08/21/17 05:27 PM
Joined: Jan 2007
Posts: 446
LBP
Mr_Accord Offline OP
Mr_Accord  Offline OP
Joined: Jan 2007
Posts: 446
LBP
I'm currently in the process of restoring a set of pitted & fogged up lights I pulled off a parts car. Ive come across a weird blemish in the lens that is apparent on both lights. I'm not sure if this is on the outside or inside of the lens. If on the outside could it be my sanding technique? or possibly just a heat wear mark from the bulb on the inside of the lens over time? I usually start off with a 600/800grit depending on bad they are, and then move on to wet sanding with 1000grit, then 2000 in a crisscross pattern followed by M105/205 using a DA w/cutting pad.

IMAGES HERE

Last edited by Mr_Accord; 08/21/17 05:28 PM.

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Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494649
08/21/17 05:39 PM
08/21/17 05:39 PM
Joined: Sep 2005
Posts: 5,782
MIchigan
Warstud Offline
Warstud  Offline
Joined: Sep 2005
Posts: 5,782
MIchigan
About all you can do is Clear Coat it and hope it disappears.

Re: Sanding foggy lights....blemish marks remain [Re: Warstud] #4494681
08/21/17 06:20 PM
08/21/17 06:20 PM
Joined: Jan 2007
Posts: 446
LBP
Mr_Accord Offline OP
Mr_Accord  Offline OP
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Posts: 446
LBP
the second pic is after clear coating then polishing. Still remains.


1990 VW Jetta GL 1.8L 8V - SOLD
1992 Honda Accord Lx - SOLD frown
1993 Ford Aerostar XL 4L V6 - Retired RIP
2004 SAAB 9-3 ARC 2.0T - Current
Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494720
08/21/17 07:12 PM
08/21/17 07:12 PM
Joined: Aug 2003
Posts: 12,971
NE,Ohio
Rand Offline
Rand  Offline
Joined: Aug 2003
Posts: 12,971
NE,Ohio
looks like a stain on the inside?.. kinda odd.


2019 Jeep Cherokee Trailhawk 2.0T
Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494725
08/21/17 07:23 PM
08/21/17 07:23 PM
Joined: Sep 2015
Posts: 985
PENNSYLVANIA
JeepWJ19 Offline
JeepWJ19  Offline
Joined: Sep 2015
Posts: 985
PENNSYLVANIA
Yes definitely seems odd. We did the sanding technique on dad's fogged up lights. Last 4 years before fogging again.

It was too much work vs buying new lights.
Water sanded them using same steps you did.
Then buffed the headlights
Then applied 3M clear coat to them

Never again.


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Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494785
08/21/17 08:28 PM
08/21/17 08:28 PM
Joined: May 2012
Posts: 1,609
The land of USA-made Subies!
SubieRubyRoo Online content
SubieRubyRoo  Online Content
Joined: May 2012
Posts: 1,609
The land of USA-made Subies!
I bought the Mother's power ball kit to use on my 01 Forester and 06 Odyssey. I had the same thing on mine; it took more sanding with the lowest grit paper disc until all of that roughness was gone. It took a long time but it finally all came out.

Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494862
08/21/17 10:09 PM
08/21/17 10:09 PM
Joined: Aug 2008
Posts: 3,221
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline
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Posts: 3,221
Where the wind comes sweepin'
Looks like a heat mark to me.

Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494865
08/21/17 10:14 PM
08/21/17 10:14 PM
Joined: Apr 2007
Posts: 2,879
WI.
dblshock Offline
dblshock  Offline
Joined: Apr 2007
Posts: 2,879
WI.
YouTube has a guy doing it with Mothers aluminum polish and a buffer..looks pretty good but if your after perfect maybe cheaper to just replace.


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Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494879
08/21/17 11:03 PM
08/21/17 11:03 PM
Joined: Jun 2008
Posts: 444
The 805, CA.
FastEddie Offline
FastEddie  Offline
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Posts: 444
The 805, CA.
Those headlights are pretty jacked up. If sanding by hand, keep sanding. This is why I always use a machine when sanding headlights. They can take a long time to fix, and many times will never come perfectly clear.

Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4494889
08/21/17 11:21 PM
08/21/17 11:21 PM
Joined: Mar 2007
Posts: 204
Minneapolis
03cvpi Offline
03cvpi  Offline
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Posts: 204
Minneapolis
Looks like one of the lamps exploded. I've seen that on a few cars, we just empty out the pieces and maybe wash out the inside of the housing, left dry and put back in service.

Re: Sanding foggy lights....blemish marks remain [Re: FastEddie] #4496514
08/23/17 09:49 PM
08/23/17 09:49 PM
Joined: Jan 2007
Posts: 446
LBP
Mr_Accord Offline OP
Mr_Accord  Offline OP
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Posts: 446
LBP
Originally Posted By: FastEddie
Those headlights are pretty jacked up. If sanding by hand, keep sanding. This is why I always use a machine when sanding headlights. They can take a long time to fix, and many times will never come perfectly clear.


What type of machine are you using? Polisher with a hook and loop sanding pad?

Last edited by Mr_Accord; 08/23/17 09:51 PM.

1990 VW Jetta GL 1.8L 8V - SOLD
1992 Honda Accord Lx - SOLD frown
1993 Ford Aerostar XL 4L V6 - Retired RIP
2004 SAAB 9-3 ARC 2.0T - Current
Re: Sanding foggy lights....blemish marks remain [Re: 03cvpi] #4496515
08/23/17 09:50 PM
08/23/17 09:50 PM
Joined: Jan 2007
Posts: 446
LBP
Mr_Accord Offline OP
Mr_Accord  Offline OP
Joined: Jan 2007
Posts: 446
LBP
Originally Posted By: 03cvpi
Looks like one of the lamps exploded. I've seen that on a few cars, we just empty out the pieces and maybe wash out the inside of the housing, left dry and put back in service.
Yeah I think the inside is a heat mark after looking it over further. Unfortunately I can't access the inside enough to clean it out.


1990 VW Jetta GL 1.8L 8V - SOLD
1992 Honda Accord Lx - SOLD frown
1993 Ford Aerostar XL 4L V6 - Retired RIP
2004 SAAB 9-3 ARC 2.0T - Current
Re: Sanding foggy lights....blemish marks remain [Re: Mr_Accord] #4497667
08/25/17 10:51 AM
08/25/17 10:51 AM
Joined: Feb 2003
Posts: 7,539
Jupiter, Florida
Cujet Offline
Cujet  Offline
Joined: Feb 2003
Posts: 7,539
Jupiter, Florida
The only way I ever get good results is to sand the hard coating off, and well into the soft plastic. With the ever finer paper method mentioned above.

Then buffing with a Blue Point/Snap on 3 inch detail buffer and Flitz. Coat with wax afterwards. I don't clear coat them, as my last clear coat attempt eventually had degradation under the clear, that needed to be sanded and buffed.


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