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.
A qualified exterior house painter can walk you through the process of getting your house ready for a new coat of paint, from scraping and sanding to patching and priming. A pro can also recommend the best exterior paint for the job, whether your siding is wood, fiber cement, stucco, vinyl, or even metal. When it comes to getting the work done, your painter will arrive with all the tools and equipment needed to get the job done quickly, correctly and safely.
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.