[Zeke]

Air driven guns are not a good choice for architectural paints unless you have one specifically set up. Not very many of those around anymore. Use an airless or paint it the old fashioned way.

I like to use an airless to move the paint from the can to the wall, but I will back roll my work to work it in. I might as well be using a power roller, but I'm not too thrilled about those gizmos.

What's the surface of the exterior?

Whatever you do and whomever you listen to, clean the surfaces to be painted very well. Sand and prep as needed. Clean the prepped areas again of sanding dust.

Whoops, I guess Webb said it all first.