I never waste the money on those headlight kits......what I do is I get some 800 and 1200 grit wet sandable paper.
I wet sand and wetsand until it appears I have got any imperfections out.
Then I use 3M rubbing compound and squirt it on where I just wet sanded.
I then use a small buffing pad and wheel on a drill bit attachment and chuck it into my drill.
I then buff in circular motion with slight pressure until you feel slight resistance and the compund looks like its starting to get chauky in texture.
I then take water and wipe away and compound residue and check my progress,if more is needed then repeat the compund and buff steps.
Then when it looks like you have its close to done or done,I then squirt more compound on and I buff manually by hand in a fast circular motion,then wipe it away with a wet cloth.
I then use turtle wax paste on the hole thing and let it dry and wipe it away and it looks like brand new when done!
If you don't have any rubbing compound,you may be able to get away with taking some baking soda and mixing it with a bit of water until you get a paste which will act as a compound.
Hope this stuff is something that can help ya out