Section 31 wrote:
I just bought some standard latex paint to paint aluminum garage doors.
The woman at Home Depot made it a satin finish. Is that Ok to paint
an exterior garage door ?

It's your door to do with whatever you please.

Is that standard ?

NO. It is not. Most aluminum doors are unpainted. You could just
try giving it a good cleaning with a power washer.


Or should it have been
different such as eggshell or semi gloss ? Will satin last a long time
?
Not as long as High gloss enamel which is the longest lasting.