I feel like I wasted my $60 on this Opti-lens. I tried my first set of lights and OMG! I sanded and compounded and compounded some more, then applied it and it looked like crap. I compounded more and it still looked like crap. Opti-lens is not for me.
Hum... I am not sure I follow you there.
Opti-Lens is not what will make the headlight look good. If it looks like crap before applying, it will look the same afterward. The job of opti-lens is to provide UV protection to the plastic and seal it to protect it from the weather...
Try again to sand and polish it, here is what I suggest:
Start with 500 grit sand paper and dry buff until the entire lens looks opaque and the same white color.
Next step, clean the lens with a damp microfiber towel making sure no sanding dust remains.
Now use a 800-1000 grit sandpaper to remove the 500 scratches. Sand until the lens is uniform.
Clean again
Then you have 2 choices, you can either go to a 1500-2000 sand paper to remove the 800/1000 scratches or you can go directly to 3000. If you go directly to 3000 it will take more time to do the job but you save a step. Up to you. For the 3000 step, use a wetsanding method. So keep the lens wet with a spray bottle filled with water.
Once you can't see any scratches and the plastic looks uniform and clear. It's time to switch to polishing.
Make sure to clean the lens well before starting the compound/polishing.
You can pick what ever compound and polish you like.
Once you are done with the polishing step your headlight should be completelly transparent. If they were neglected for a very long time the plastic may be cracked (maybe that is why you feel they look like crap?). Either way, if you are pleased with the way they look, now is the time to seal them. If not, keep polishing. Note that cracks can't be removed, so don't waste your time trying. If the reason you feel it looks bad is because they are scratched, then you have not sanded enough or maybe you skipped steps so you have scratches that you put in and where not removed by the later steps. If it's still opaque/yellow then you simply either did not use an agressive enough sand paper or you did not sand long enough. 500 should take care of pretty much anything, I heard some people going lower but I would not recommend that!
Do you have pictures? Maybe someone can give you more specific advice for the problem you are having?