“Sand : All of these products use an abrasive such as sandpaper to scuff away the outer layer of haze....”
But what grit?
1000? 1200?
Buy a good kit:
3M I have used- just follow the instructions.
Have not used any others.
Have not used the UV Protectant.
Don’t just go buy XXXX grit sandpaper and some polishing compound unless you know what you are doing, USE A KIT!