Des Moines asks a lot of a house. We swing from July sun that bakes south-facing siding to January cold that turns morning frost into a daily freeze-thaw cycle. Paint that would live a comfortable life in a milder climate ages twice as fast here.
When we specify an exterior system, we're thinking about three things: flexibility, so the film can move with the siding as it expands and contracts; adhesion, which is earned in prep more than purchased in a can; and UV resistance, which is what keeps a deep front-door color from chalking out by its third summer.
We use premium professional-grade exterior lines for a reason, the resin quality is what you're paying for, and it's the difference between repainting in twelve years instead of six.
One honest note: no coating outlasts bad wood. If we find soft trim or failing caulk during the walk-around, we'll tell you before we paint, because paint over rot is a bandage on a problem that's still growing. Fixing it first is always cheaper than fixing it twice.