I tried a full-up polishing kit a year ago. It worked fairly well, but I never put on the sealer, and now the lenses are totally frosted.
I took them off of the car to polish them, though. It saved me a lot of time and worry, overall. I recommend if you go down this path that you do the same.
A few months ago, I bought a used set through Craigslist. I made a bad choice, and while the lenses were clear, there was irreparable damage to other parts of the assemblies (corrosion, crappy hand-repairs to the wiring, etc.). I just now threw them away. $40 wasted.
A few days ago, I got a great, used set through Facebook Marketplace. $20, total, for a very clean used set for the 2006-2008 NF, and in excellent shape front to back. This time, I looked VERY carefully!. One requires just a scosche of polishing, then I'm sealing both assemblies and installing them in a few days. I had to buy the sealer through Amazon. None of my local "Advanced Auto" stores carry it.
Still, make sure that they're good inside and out if you go this route. Also, save your old assemblies for comparison before you put in the replacements. I had to scavenge some of the "vents" for the newest set from the junk set.
Make sure you buy the right assemblies, though. Just in case you're unaware (or if some new reader here is unaware), the later years (after 2008) do NOT fit the 2006-2008 model vehicles.
Last edited by Boothby171; 04-15-2019 at 12:51 AM.