View Single Post
Old 10-13-2014, 11:12 AM   #1 (permalink)
Daox's Avatar
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,022

CM400E - '81 Honda CM400E
90 day: 58.68 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 56.69 mpg (US)
Thanks: 2,344
Thanked 2,417 Times in 1,462 Posts
How to polish headlights so it lasts (re-adding UV protection)

Polishing headlights is ridiculously easy, however they always seem to yellow again after a couple months (or less). The reason being is that by polishing the headlights to remove the yellowed plastic, you remove what is left of the ultra violet (UV) OEM coating on the plastic. So, to fix it, you need to add some form of UV protection back to the headlight lense. Here is how I did it.

I started out with Meguiar's PlastX, and a cloth buffing wheel on my battery drill. That gets rid of the yellow oxidized layer of plastic on the headlights. Its pretty quick work with the battery drill.

Here we have one light done, and the other obviously not done. I had just done these about 3 or 4 months ago and you can already see how bad they were without re-adding some form of UV protection.

To add that UV protection, I grabbed some spar urethane. You add some mineral spirits to cut it. Use a 50/50 mix. Then dab a cloth in the urethane and rub it on the headlight. You barely need any to do the lights as this stuff is thin. I used a quarter sized drop of each on a yogurt lid and that was more than enough.

And of course, here are some of the before and after pics of the light to show how pretty it is now.

I haven't seen how long this lasts. I've read it'll last 2 years. I actually would like to put another coat or two on since its so thin. Seems like that would give you a bit more time.

Attached Thumbnails
Click image for larger version

Name:	IMG_20141010_194035.jpg
Views:	3050
Size:	76.4 KB
ID:	16107   Click image for larger version

Name:	IMG_20141010_193118.jpg
Views:	3046
Size:	80.0 KB
ID:	16108   Click image for larger version

Name:	IMG_20141010_193200.jpg
Views:	3058
Size:	84.6 KB
ID:	16109   Click image for larger version

Name:	IMG_20141010_192204.jpg
Views:	3044
Size:	74.2 KB
ID:	16110   Click image for larger version

Name:	IMG_20141010_193046.jpg
Views:	3041
Size:	89.3 KB
ID:	16111  

Click image for larger version

Name:	IMG_20141010_192211.jpg
Views:	3034
Size:	85.1 KB
ID:	16112   Click image for larger version

Name:	IMG_20141010_193054.jpg
Views:	3039
Size:	88.4 KB
ID:	16113  
Current project: Adding regenerative braking to the Mirage
  Reply With Quote
The Following 15 Users Say Thank You to Daox For This Useful Post:
AbramWagner (06-17-2015), AndrzejM (10-30-2014), Carbon (03-26-2015), Cd (10-09-2015), darcane (10-14-2014), Ecky (02-03-2015), gone-ot (10-13-2014), iveyjh (10-13-2014), jeff88 (12-09-2014), mcrews (10-14-2014), MetroMPG (10-13-2014), NeilBlanchard (12-28-2015), rumdog (02-02-2015), svpremo (04-13-2016), Xist (10-13-2014)