In some cases, professional painters may include additional charges for specialized equipment that homeowners can't purchase on their own. Because professionals have licenses and access to such equipment, it's simpler to let them get those themselves. But providing some of the smaller equipment and extras directly really can help to cut down on the total cost of your project.
"I had tru colors paint my home office. They delivered a beautiful paint job, on time, with no issues. I have also used them in the past for having the exterior of my home painted, which was also an excellent job, delivered on time and within budget. I will be using them to have the rest of my home painted, and will most likely have trim and molding work done by them too. Highly recommended!!!"
Oh, where to begin? Let me start with 'watered down paint'. 25-50% before the material gets to the site? Impossible. You would basically be painting with water at that point. It would be less of a hassle, and cost, to simply use proper material. You would be forced to apply three coats instead of two, as the coverage would be horrible. Whatever cost you think might be saved in materials would be lost in labor.