Rust on cars is nothing new and it happens to every vehicle eventually but sometimes when you are refinishing a vehicle you can introduce problems that cause immediate or early corrosion problems.
A relatively new problem that many technicians are dealing with is corrosion on aluminum parts. Many hybrids and high MPG vehicles are using aluminum for exterior skins and structural parts. Additionally most drive trains have been using aluminum for decades so if you are repairing parts of this type you need to understand how to prepare them and what paints are appropriate for refinishing.
Common …

Paint Color Mismatch is a problem that many technicians have to deal with and the problem can be both formulation and technique used while applying paint.
Engine Compartments are often the most abused areas in our vehicles. If you work on your vehicle a lot then you are likely to get chemicals on your paint, scratches from removing and installing parts and because its not an area that everyone else sees it often gets neglected.
Although Clearcoat may discolor over many years there is another problem when the paint you apply is an off color or yellow in comparison to the rest of the vehicle.