It was a bitch, I tried using 100 grit by hand and it didn't do much, had to smooth it with a 120 grit disc on the dremel, and that left a lot of gouges, which meant lots of sanding and filler primer. I got most of it smooth across the front, but the seam along the bottom was pretty rough, along with the corner that goes to the tb. But all in all it looks good, better than the factory tube did.