I picked up a Maxton Design Gurney Flap V1 last year and it came with a gloss coat that just didn't look right to me after some time. After removing it and debating if I should put it back on. I decided to give it another go with the proper paint color and give it one more try.
Took about 3 weeks between removing 3M sticky crap from my wing and the gurney flap, sanding it down, waiting for the paint to come in, prime, paint and get new 3M tape on. Finally got it back on last night. Its functional for sure and love the unique look it gives.
I'll get some good pics when I have some time.