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.
When performing a spot repair it is to be understood that any formulation of paint mixed by the technician will not be an exact match to the color that is on the vehicle. This is true if you are picking colors from a chip book or using a analyzer that inspects the vehicle’s paint for color matching and mixing suggestions.
For this reason it is appropriate to blend colors across panels …

Plastic parts can be the most difficult areas on a vehicle to paint and keep looking good. The problem with plastic parts is that other then bumper covers they normally are designed to be impregnated with color and painting the surface is a restoration option.
Some metallic paints out there are getting out of hand I recently painted a metallic red on a friends ford and when I saw it in full sun the next day all I could think was they must have cut the throat of a MySpace Glitter Unicorn to make this paint.
This is a question about doing a spot repair on a vehicle that was previously painted with Lacquer Paint and whether it is best to repair with the same type paint or use a newer technology.