if you sand the lights and the apply VHT..... you will NEVER GET IT OFF!!!!!!
I never tried to remove it.... but it's made to adhere to plastic lights, I would imagine that with a lot of work, you could revert the lights to a just polished look if they weren't sanded prior to VHT application...
I did not use an extra set, as I was confident in my painting skills (being a paint and body guy).... and I promised myself I wouldn't destroy anything....
If you use too heavy of a grit sandpaper, it is possible that there would be scratches that won't come out with polishing..... I would not go any coarser than wet 600 on plastic tails or markers.....
Also, keep the paper wet, dry the light from time to time to check your progress, and don't be in a hurry...... The object is not to sand THROUGH the lense, but just to make it smooth for polishing, or smooth with a bit of tooth for paint application......
Also, with The VHT..... make sure you allow AMPLE DRY TIME BETWEEN COATS.... I was anal and made things a 2 day project.... spray, wait 2 hours, wetsand lightly to remove dust nibs, spray again, wait another 2 hours.... repeat..... THE KEY IS GETTING IT ON EVEN!!!!!!!!!!