I restored my lamp units. I tried the polishes but in the end I had to break out the sandpaper. I have worked with plastics in industry and when the ploycarb starts to breakdown it looks like a fog and not repairable. once I got them as good as they could ever be (some milky-ness) I polished them as smooth as possable.

The real cure was not applying any clear sealer or clear coat but installing a clear impact cover like that from RVinyl or the like. I chose the clear rather than a tint due to the reduced light on the road however higher power light gear address that issue but the clear impact covers sealed the lens for keeps.

Try them, they are cheap and can be removed without any issues. I did install high out blue LED lamps inplace of the 194's in light housing, try that before you invest in the whole bake-and-brake for the Halo mod, you might just stand back and say COOL, I'm done.

As far as the Halo mod, my Yellow Roadster is problem enough. I have a baby blue 1955 Thunderbird that I thought attracted attention but this Yellow ZH Roadster with some chrome and after market wheels is outragious. It stops traffic, my wife causes accidents when she drive it (she's a blond fox). I could not imagine what would happen if I added the Halo lights. Seriously, its a ***** driving this yellow ZH without being a spectical, you guys with the yellow ZH's know the issue (never thought I would ever talk like this).