For metal doors such as a steel storm door work with oil based paint to stave off the formation of rust.
Brown oil paint for doors.
The kilz 2 multi surface acts as a glue between old and new paints while also offering excellent protection against mild to medium stains that may seep through while the primer is wet.
If you do not prime the paint will rub right off when it is dry.
For example a light taupe door would pair well with white trim and brown siding.
Find oil based exterior paint at lowe s today.
If you are going to be painting over an oil based paint with latex you must first sand it lightly and prime it with a good gripping primer.
For doors that have older paint layers you will need a good primer to help the paint stick to the old layers.
Even if your door is not too dirty give it a cleaning with soap and water and then rinse with clean water to remove any soap residue.