Restoring Mercedes Headlamps w/ Sanding Process

markaw

New member
Over the years I have shown many auto owners how to restore headlamps by using just the Acrylic-Werks Polish and not utilizing a sanding process. This can only be accomplished if the headlamps do not have a failing clearcoat. The way to identify the difference between types of damage is:

1. If you run your hand over the lamp and feel an uneven surface, it is peeling or it may have turned a milky white and the surface feels rough to the touch, then this headlamp will probably require sanding.

2. If your lamp has a slightly yellow to gold, cloudy or grayish surface and is somewhat smooth to the touch then this headlamp could be restored by polishing only. Have a couple of these videos on YouTube where I restored the headlamps on a Nissan Maxima and Volvo 240DL. The restoration is fairly quick.



I have wanted to film an actual headlamp restoration process that required sanding (video links below)for quite a while, fortunately the owner of this Mercedes was open to a free restoration since he had no desire to pay for the OEM replacement lamps. Crazy expensive. This is the short version and the "Real Time" video is 20 min and available on YouTube. To do this job, I used the following products and process:

1. Used the 3M Headlamp Sanding Kit. It has blown my mind how many people told me that they bought this kit and stated that it had not worked for them. So I tried it and if your not apprehensive about the process you can get great results. It's alarming how many people sand headlamps that do not need to be sanded.

2. Mask around the lamp with painters tape. Make sure you lay down it down 2 times, in case your drill skips. You may also want to tape any exposed paint near the lamps.

3. Wipe the lamps down with a damp cloth.

4. You will start with the "Gold" 500 Grit sand paper. This is a dry sanding process. Sand evenly without adding too much pressure. As you do this, you will easily see the old clearcoat. Continue until all the clearcoat is gone and the lamps look frosted. Do not panic when you see the abrasions. Wipe the surface with a damp cloth, inspect and repeat if needed, then go to the next step.

5. Pull the 500 and attach the "White" 800 Grit sand paper. This is also a dry sanding process. The key to this step is to remove any abrasions the 500 Grit left behind. Do this until the light frosting color is uniform. Wipe the surface with a damp cloth, inspect and repeat if needed, then go to the next step.

6. Pull the 800 and attach the "Gray" 3000 Grit sand paper pad. This is the wet sanding process. Mist the lamp and pad with water. Do this until the lamp becomes mostly clear and ALL abrasions have been removed. Wipe the surface with a damp cloth, inspect and repeat if needed, then go to the next step.

7. Pull the 3000 and attach the "Orange" Waffle Polishing Pad. This is where I change the process (I have used the 3M Polish provided in the kit in the past but found that the lamps faded again, far to soon. IMO this can only be due to the abrasives in the polish - After finishing the lamp with a 3000 Grit wet sand it is almost perfect, so why hit it with another abrasive, which will create new swirl marks in the finished lamp and allow it to oxidize much quicker) and add the Acrylic-Werks Polish (which is non-abrasive) to the orange pad and mist the lamp with water. Do this process until the lamp is clear. Do not buff dry at this point!

8. Put a little Acrylic-Werks Polish on a damp washcloth and wipe the lamp.

9. Pull the tape and follow Step 8 and include black rubber, plastic and paint around lamp, then buff the surfaces dry. Lamps should stay in this condition for 1 year and only require the Acrylic-Werks Polish in the future to maintain. No More Sanding!



I sincerely hope this helps anyone who desires to restore their headlamps themselves.





YouTube - Mercedes Headlamps Restoration-Short Version





YouTube - Mercedes Headlamp Restoration Real Time
 
Going from 800 to 3000 grit paper isn't going to work very well. You need to slowly work your way up to finer and finer sand paper. The 3000 paper is not going to be able to remove the sanding marks from the 800 grit paper. After 800 I would use maybe 1200-1500 and then 2000 and finally 3000 paper.
 
SilverCivic- Thanks for the info. On the Mercedes I checked for abrasions after the 800 Grit and found them to be very light. After the 3000 Grit I checked again and this time found no abrasions. The Waffle Pad and AW yielded a beautiful finish that was abrasion free and absolutely smooth. I will check with the Sherwin Williams Auto Paint Supply Shop to see if 3M offers anything between the 800 and 3000 Grit Sandpaper in the 3" diameter that works with this paticular system.
 
Also when you wet sanding with the 3000 grit paper you might want to use more water. The water is used to remove the tiny plastic particles from the sand paper. Simply squirting water on the light probably wont be enough. Try having someone with a bottle of water pour it over the light as you sand it. And also periodically submerge the paper under water. This will prevent the pores of the paper from getting clogged and not being able to sand.
 
markaw said:
Over the years I have shown many auto owners how to restore headlamps by using just the Acrylic-Werks Polish and not utilizing a sanding process. This can only be accomplished if the headlamps do not have a failing clearcoat. The way to identify the difference between types of damage is:

1. If you run your hand over the lamp and feel an uneven surface, it is peeling or it may have turned a milky white and the surface feels rough to the touch, then this headlamp will probably require sanding.

2. If your lamp has a slightly yellow to gold, cloudy or grayish surface and is somewhat smooth to the touch then this headlamp could be restored by polishing only. Have a couple of these videos on YouTube where I restored the headlamps on a Nissan Maxima and Volvo 240DL. The restoration is fairly quick.



I have wanted to film an actual headlamp restoration process that required sanding (video links below)for quite a while, fortunately the owner of this Mercedes was open to a free restoration since he had no desire to pay for the OEM replacement lamps. Crazy expensive. This is the short version and the "Real Time" video is 20 min and available on YouTube. To do this job, I used the following products and process:

1. Used the 3M Headlamp Sanding Kit. It has blown my mind how many people told me that they bought this kit and stated that it had not worked for them. So I tried it and if your not apprehensive about the process you can get great results. It's alarming how many people sand headlamps that do not need to be sanded.

2. Mask around the lamp with painters tape. Make sure you lay down it down 2 times, in case your drill skips. You may also want to tape any exposed paint near the lamps.

3. Wipe the lamps down with a damp cloth.

4. You will start with the "Gold" 500 Grit sand paper. This is a dry sanding process. Sand evenly without adding too much pressure. As you do this, you will easily see the old clearcoat. Continue until all the clearcoat is gone and the lamps look frosted. Do not panic when you see the abrasions. Wipe the surface with a damp cloth, inspect and repeat if needed, then go to the next step.

5. Pull the 500 and attach the "White" 800 Grit sand paper. This is also a dry sanding process. The key to this step is to remove any abrasions the 500 Grit left behind. Do this until the light frosting color is uniform. Wipe the surface with a damp cloth, inspect and repeat if needed, then go to the next step.

6. Pull the 800 and attach the "Gray" 3000 Grit sand paper pad. This is the wet sanding process. Mist the lamp and pad with water. Do this until the lamp becomes mostly clear and ALL abrasions have been removed. Wipe the surface with a damp cloth, inspect and repeat if needed, then go to the next step.

7. Pull the 3000 and attach the "Orange" Waffle Polishing Pad. This is where I change the process (I have used the 3M Polish provided in the kit in the past but found that the lamps faded again, far to soon. IMO this can only be due to the abrasives in the polish - After finishing the lamp with a 3000 Grit wet sand it is almost perfect, so why hit it with another abrasive, which will create new swirl marks in the finished lamp and allow it to oxidize much quicker) and add the Acrylic-Werks Polish (which is non-abrasive) to the orange pad and mist the lamp with water. Do this process until the lamp is clear. Do not buff dry at this point!

8. Put a little Acrylic-Werks Polish on a damp washcloth and wipe the lamp.

9. Pull the tape and follow Step 8 and include black rubber, plastic and paint around lamp, then buff the surfaces dry. Lamps should stay in this condition for 1 year and only require the Acrylic-Werks Polish in the future to maintain. No More Sanding!



I sincerely hope this helps anyone who desires to restore their headlamps themselves.





YouTube - Mercedes Headlamps Restoration-Short Version





YouTube - Mercedes Headlamp Restoration Real Time





Sir, Thank you for the great post. If I may comment and ask you a few things please.



When sanding down lens on a vehicle "I assume were talking about todays modern polycarbonate lens" I see your using 500 hundred grit on a direct drive machine. The drill. My first question is wouldn't this be easy to do with a dual action machine?



Also when polishing lights how will the polycarbonate not fail in a few months. They need a sacrifical layer of protection. No polish will hold up to do this permantly. By using a direct drive rotation machine like you did your gonna build heat. Heat causes friction and friction could acually warp polycarbonate. I understand polycarbonate is a very strong plastic, but your actually melting it when you think about it. By not only thinning the plastic after the sanding process and then heating it by polishing, I see a potential for more severe headlamp failure down the road. what are your thoughts on this?
 
Barry- Thanks for the kind words. Depending on who the manufacturer of the headlamp lens is may actually determine how hard or soft that paticular lens will be. The 3M Kit I used recommended using a drill. To make this video, I wanted to follow their directions exactly so even the every day car owner can see how the sanding kit works. After a little over a year of doing this process I have damaged no lamps. The one key I did learn along the way was, following the 3000 Grit wet-sand I quit using the polishing compound as it would leave swirls in the lens and as you mentioned, lamps re-fading in less than 60 days was pretty common so I decided to try the Acrylic-Werks Polish as the final step. The only reason I wanted to try this was one of my long time customers who did custom painting at Just For Trucks had been using 3M Pecfect-It II Polishing Compound after color sanding a paint job, then used a wax and show glaze to finish. What really struck me, was using the polishing compound after all that labor intinsive sanding to make the surface flawless. I had him try the Acrylic-Werks after they had color sanded a fiberglass tonneau cover. The end result blew his mind when the t-cover came out a rich bright red, required no additional products on the surface and had no swirl marks in the paint. So...knowing this, I tried the new final step out on my son's 2000 Ford Taurus that had the clearcoat peeling away on the headlamps. This time, by polishing the lamps with the acrylic I can say that they have now reached 13 months and still no fading. I can only attribute this to the fact that this polish is a non-abrasive, water-based acrylic polish that leaves a compatible coating that will expand and contract with the surface it is applied on.



In regards to possibly melting or warping a lens. First, thank god this has never happened to me. I believe that as long as you do not apply too much pressure or hold the drill on one place for too long, you will be fine. If you noticed in the video, the drill, while sanding and in the polishing step, is in constant motion. I also wiped the surface of lens and checked it between each step.



As soon as we get some decent sun here in Suffolk, Va. I will get a black car in need of some serious TLC and film my technique for polishing and claying a surface in the direct sun. I've had many people say during the demo that claying was not supposed to be done like this but when the demo was completed, catching their expression is priceless.
 
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