Hi~~we just used rust proof paint on our steel door both in and out and just used a roller and a paint brush and it has held up thru the weather really well. Hope this helps :0)
First, sand off any rust and then prime the complete door with a rust inhibiting (oil base) primer. For a finish paint, I would recommend an oil base finish. However, you can use a latex if you so desire.
If the door is flat with no panels, use a 9" with a 1/8" nap roller and a quality paint brush. If the door has panels, use a 4" with a 1/8" nap roller and a quality paint brush.
Make sure you buy a high quality roller. A cheap roller will give your door plenty of unwanted fuss.
For exterior - use exterior paint and interior - use interior paint.
Work quickly because the paint will start to get tacky and then you will have problems.
I can only give you an example since I am no pro at the rules. My mom has a metal door and it is green on the outside and white on the inside(to go with her house). She is very into interior design so I imagine that is how it is done. I hope that helps you, and saves you some paint;-)
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