alright i got tinted taillights but i want them darker, i wanna do VHT nightshade on them ontop of the tint i alrdy have but thing is the tint on my tails are on the outside and not the inside, i know u gotta prep the taillights up with soap and water and different grids of sandpaper but i cant use the sandpaper cause it will/possibly scratch the tint, would i be able to skip the sandpaper process and it still look good? or is there another way? (im not removing the tint on my tails)