Rob,
As a professional painter, I would be suspect of something I didn't apply, especially if it was from a spray can, or the prep work was questionable.
As a homebuilder, I would want to protect and prime (if not paint) everything as I go in order to minimize the amount of disassembly needed later, especially by a painter that may not understand what they are taking apart.
I usually suggest that folks come up with a color and overall interior/exterior plan so that, if able, they can paint the difficult areas inside as they build and the pro can just come back behind them and do the obvious areas. Best of both worlds...
Brad Simmons
Airframes Inc.
Milan, TN
731-686-3610
Brad@Airframesinc.com