yes you have to if you are doing red, if you dont it will barley show through i did it without sanding first and it didnt really work at all but then i took the cluster apart and sanded it and it worked great, the needles are a little hard to see but other then that the color is great
they look a lot better in person the hot spots don't really show up at all
they look a lot better in person the hot spots don't really show up at all