Go Back  Bike Forums > Bike Forums > Classic & Vintage
Reload this Page >

Yellowed Lens on Sturmey-Archer Headlamp

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

Yellowed Lens on Sturmey-Archer Headlamp

Old 08-23-10, 08:50 PM
  #1  
gna
Count Orlok Member
Thread Starter
 
gna's Avatar
 
Join Date: May 2009
Location: St. Paul, MN
Posts: 1,604

Bikes: Raleigh Sports, Raleigh Twenty, Raleigh Wyoming, Schwinn Le Tour Luxe Frankenbike

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 24 Post(s)
Likes: 0
Liked 4 Times in 4 Posts
Yellowed Lens on Sturmey-Archer Headlamp

I have an old, decrepit SA headlamp from the old country, with a yellowed lens. I want to clean it up. I've been searching for awhile, but I can't find it. A while back someone mentioned a product they used to clean and polish up old, foggy, yellowed Headlamp Lenses. rhm, I'm looking in your direction...
gna is offline  
Old 08-24-10, 05:29 AM
  #2  
JML
Senior Member
 
JML's Avatar
 
Join Date: Jun 2009
Location: Pittsburgh, PA, USA
Posts: 158

Bikes: 3Rensho SR Export

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
If the lens is plastic, you want one of the polishes sold for acrylic automobile headlight lenses/covers or aircraft canopies. But all it will do is remove the surface scratches and discoloring; if the discoloring is all through the lens, I don't believe there's any way to clean it.
JML is offline  
Old 08-24-10, 05:50 AM
  #3  
rhm
multimodal commuter
 
rhm's Avatar
 
Join Date: Nov 2006
Location: NJ, NYC, LI
Posts: 19,066

Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...

Mentioned: 438 Post(s)
Tagged: 0 Thread(s)
Quoted: 1540 Post(s)
Likes: 0
Liked 12 Times in 11 Posts
Well, I don't have a magic product either, and like JML says, I don't think you can change discolored plastic back to clear. But I have cleaned up a couple of those Sturmey Archer lenses with pretty good --not stellar-- results. In both cases the plastic had yellowed and developed a patchy kind of frost.

If I recall correctly, I sanded the whole surface of the lens with superfine sandpaper --you can get 1000, 1500, even 2000 grit at an auto parts store-- until all the frosting and scratches were gone. Do this in a sink full of soapy water. Then I polished them with polishing compound --also from the auto parts store. In the end I think I also polished them with wax. The stuff JML mentions sounds like a good idea, but I haven't tried it. An acrylic clearcoat might be a good idea, but I haven't tried that.
rhm is offline  
Old 08-24-10, 06:03 AM
  #4  
mkeller234
Rustbelt Rider
 
mkeller234's Avatar
 
Join Date: Oct 2008
Location: Canton, OH
Posts: 8,612

Bikes: 1990 Trek 1420 - 1978 Raleigh Professional - 1973 Schwinn Collegiate - 1974 Schwinn Suburban

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Likes: 0
Liked 14 Times in 10 Posts
Originally Posted by rhm View Post
If I recall correctly, I sanded the whole surface of the lens with superfine sandpaper --you can get 1000, 1500, even 2000 grit at an auto parts store-- until all the frosting and scratches were gone. Do this in a sink full of soapy water. Then I polished them with polishing compound --also from the auto parts store. In the end I think I also polished them with wax. The stuff JML mentions sounds like a good idea, but I haven't tried it. An acrylic clearcoat might be a good idea, but I haven't tried that.
I did that with one of those older plastic ipods. It was so scratched up you couldn't read the screen but it sanded and polished up really nice.
__________________
|^^^^^^^^^^^^^^| ||
|......GO.BROWNS........| ||'|";, ___.
|_..._..._______===|=||_|__|..., ] -
"(@)'(@)"""''"**|(@)(@)*****''(@)
mkeller234 is offline  
Old 08-24-10, 08:01 AM
  #5  
Chris_in_Miami
missing in action
 
Chris_in_Miami's Avatar
 
Join Date: Nov 2007
Posts: 4,527
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Likes: 0
Liked 1 Time in 1 Post
I've used Novus' polish system to remove scratches and surface fogging, but as JML suggests, it may not remove the yellowing. It may be yellow, but it will be yellow, shiny, and transparent!
Chris_in_Miami is offline  
Old 08-24-10, 08:49 AM
  #6  
RapidRobert
Senior Member
 
Join Date: Jun 2009
Posts: 375
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have a couple NOS lenses for those that I can sell for a nominal price. Send me a PM if interested.
RapidRobert is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
carfart
Manufacturer, Retailer, Survey and Consumer Feedback
0
06-05-14 09:23 AM
Shiloh253
Introductions
3
06-08-13 12:59 PM
standardprocess
Singlespeed & Fixed Gear
15
09-16-06 09:09 AM
BJS2003
Introductions
5
02-17-03 01:42 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.