My favorite expression I hear from some "professional painters" is "the over-spray will cover the top and bottom." I never say "I told you so" when they bring in their warped/bowed door, usually an entry door as well, I just sell them a new door - no questions asked!

It's great seeing you and Salmo G. doing quality work and some contractors still provide that level of service - interestingly they are the ones with plenty of work during this crappy economy.