I chose the water based paint because it has a shorter dry time and I think it is less stinky. I chose satin because the door faces the setting sun and a gloss might blind somebody from the reflected light! We were getting a rare rain when I took the finished photo. I had to buy a second can because I mistakenly took the wrong color card with me to the store the first time and it was too dark. They probably would have taken the darker paint back but I have some ideas to use the darker shade on an outdoor bench and a planter or two.
Once the door was fairly smooth to the touch I wiped it down with an old dry towel and again with a damp towel then let it air dry while I shook and stirred the exterior acrylic primer paint. I used a sponge roller to paint on several coats of the primer and let it dry the recommended time as stated on the can. Primer was critical for me for a couple of reasons, I needed it to level out the cracked areas and to bind the new paint to the old. I believe primer is the secret to a professional finish.
What color is your door?