Second: all the tricks of the trade in regard to "cheating" customers is for hustlers and cheaters and NOT established businesses. At the end of the project the job should come out looking professionally painted as specified in the contract. A selected color that takes multiple coats that was not calculated by the contractor should cost more money. It's not the fault of the painter.
You are right on with this - why do people leave switch plates on when it's just so easy to take them off? Another thing that happened to us - we had the popcorn ceiling taken off and the ceiling painted white. When the job was done and I later went to change out all the fixtures/fans, they had left every fixture in place, so there was a large patch of popcorn and unpainted ceiling left behind - it just didn't dawn on me to specify that they take those down before scraping and painting. It was kind of a mess.
A GREAT Paint Contractor NEVER Asks for a Deposit While some paint contractors may request a deposit before beginning the work, well-established, successful painting professionals have sufficient operating income and can easily afford to purchase materials and make payroll. BE WARY of a contractor who asks for a deposit! If he is unable to purchase materials, he's probably unable to pay his staff. Every year, too many homeowners fall victim to contractors who walk off the job - and out of town - with the deposit in their pockets. If you agree to advance payment of any kind, be sure materials have been purchased and are on your property, leaving you leverage should the contractor default on the work. Bottom Line: GREAT painting contractors NEVER request a deposit.
Thorough preparation is essential to ensure a good finish. Contractors might have to fill cracks or holes and remove old paint if it is badly worn, peeling or flaking. They remove all paint and apply a suitable primer to the bare surface. If the existing paint is in reasonable condition, they clean it and rub it with abrasive material to provide a key for the new paint. On new surfaces, such as bare wood or fresh plaster, they apply a suitable seal, followed by a primer coat.