Hey guys. Im new here.
Regarding your headlight problem, I work in a garage, we use this product all the time. It works great.
Its not "cheap" plastic. Its actually clear coat that wears off over time. Just like the paint on your car has clear coat, so does your headlamps. This stuff restores the clear coat after you sand off the original coat.
Anyways, it works great. I suggest you try it out.