I used Krylon Fuzion Clear coat with vht nightshades. My tails were sanded with 1500 grit before any paint was applied. Mine don't look faded yet. This pic is a comparison after a year, but it still basically looks the same:
If it's prepped right, and the clear coat is well applied, there should be little to no fading. I had 5-6 coats of clear coat. I sanded it with 1000 and 2000 grit, and then polished by hand with Turtle wax polishing compound. Finished it off with 3M Hand Glaze.