Back to the article. You can add water to all latex based paints / thinner to oil based paint. The tinting base has absolutely nothing to do with it. Say you are working outside and throughout the day you have to add a little water to keep the same consistency. If somebody really tried to add 20% to 50% water they no longer would be painting they'd be performing a whitewash or pickle finish.
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.
Not only careful communication is essential, but we would greatly recommend, when you pick out your type and brand of paint that you go and pay for it, with the contractor's discount, which is given by Sherwin-Williams and most paint companies. Then you will know how much paint you purchased and the coverage. If it is possible, inspect the work of the painter daily.
IF the average cost is $1700 to paint an interior, then that means the cost of paint is approx. $200 (12% of the job).  Or better said 5 gallons of paint (if the average cost is $40 retail).  The average room takes 1.5 gallons which will cover 3 average rooms.  Doesn't sound to average to anyone with knowledge of this industry or a average house.  You are misleading consumers and should do a better job in your research.  No wonder so pay people think prices to get work done by professionals is high.  Its not high, its actually average which is more like $3700.
Time is money, so we’re committed to designing and building high-performance sprayers that maximize your productivity on the job. Over 50 years ago Graco invented the first portable airless paint sprayer, and we’ve been innovating ever since. Choose from battery, electric or gas-powered sprayers for the high performance and productivity you need to grow your business and keep you profitable.
A fresh coat of paint makes everything it touches seem brand new. But such new beginnings cost real money. Professional painters charge around $4,000 for labor and materials to paint the exterior of a 2,500-square-foot, two-story home and roughly $5,500 for the interior. Painters’ rates may range from $20 to $60 an hour, but around $40 is typical in urban areas.
When coverage is difficult to estimate, add more rather than less when doing DIY wall painting. You can always pour the leftover back into cans. For large jobs, use the bucket and a roller screen rather than a roller tray. It’s much faster to load your roller with the screen than to use a roller pan. Simply dunk the roller into the paint bucket, then roll it along the screen until it stops dripping.
Picking exterior house paint colors is a lot different than picking a color for a shirt or a car.  It may help to drive around to observe colors that other homeowners have combined on homes that are of similar size and design as yours.  There are also online resources that provide homeowners with the ability to create virtual makeovers of their home by combining colors together through their software programs as well.
I did go with the highest bidder and it did not matter. They did a shoddy job and threatened to take me to court when I pointed out mistakes that they made based on their work standards stated on the quote. I have not paid them yet, just filed a complaint with the BBB. No money down asked, no contract signed. The boss stated I have to high of expectations just because I live in a 121 year old house!
The Lead Renovation, Repair and Painting (RRP) Rule establishes requirements for firms and individuals performing renovations, and affects contractors, property managers, and others who disturb painted surfaces.  It applies to work in houses, apartments, and child-occupied facilities (such as schools and day-care centers) built before 1978.  It includes pre-renovation education requirements as well as training, firm certification, and work practice requirements. 

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