For the small fenders of a Chrysler Pt Cruiser, this piece of the car's body is always frequented by various problems. The scary thing is that these defects are only symptoms of deeper and more serious issues. No matter how much work you do on what you see, you aren't actually doing anything to stop them from recurring. The main reason why these happen isn't resolved yet. The following is a summary of the root causes behind common fender problems:
Fenders properly installed on the Chrysler should produce a body that has a solid, seamless, and one-piece look. There shouldn't be any wide gaps between these and the other parts of the car. If there are huge spaces, pushing and forcing the fenders to close can only do so much. Check the bumpers, hood, light assemblies, and other components if these are distorted. Their mounting mechanisms may be bad as well which may be the reason behind the gaps.
Rust and corrosion is a big eyesore that you should take care at once. If you already removed and repainted affected areas but the problem still persists, it's possible that there is still a source of rust on a different area of the car that you should attack. This could be on another body part, in the inner panels, and under the chassis. Driving too close to other cars or over bad roads can cause small rocks and pebbles to hit, chip, and scratch the fenders' paint job. These are also ideal sources for rust.
A perfectly painted car is generally smooth to touch. If what you have is a lumpy or rough body work, that's usually the result of a sloppy paint job that skipped over vital preparation procedures. No amount of buffing will get rid of this. Take the car to a shop to redo the color.
Paint naturally loses its original glow if it's overexposed to sunlight. Unfortunately for the fenders, these are directly hit by the sun making them very susceptible to fading. Park your car under a shade or put a car cover so that repainting won't be necessary.