As my first piece using Tremclad Rust paint, I took off the right front fender, because it had a big chunk rusted out of the edge of the wheel well, and took it into my garage..

After the body work on it, I gave it 7 coats of paint, sanding with 400 after the first coat, then every 2nd coat with 600, 800 and 1000 grit.
Every time, I got to bare metal on edges and sharp folds.After the 1000 grit, it was even shinier than I had hoped for, except for the bare spots.
I gave it 2 more coats. Now, using 1500 grit, I still have about 20 small bare spots.
I'm going to have to get this back on the car, so intend to just touch up the bare spots while on the car.
Any advice on this appreciated - I still have the rest of the car to do, and need to know what I'm doing wrong.
Thanks,
Don