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.
There isn’t any set timeline when you should plan to re-paint your home. It varies depending on climate, the quality of paint that was previously applied, how thoroughly your home was prepped beforehand, and whether you hired a good painter. A poor paint job can last as little 3 years before it needs attention, and a good one can last for upwards of 20. The most important determining factor is the condition of home’s current coat. Is the paint chipped, cracked, flaking, or peeling anywhere? Are there areas of exposed wood or is there sign of water damage to either your siding or the paint itself? Finally, how does your home look? If you see any of the signs mentioned above, a new paint job is probably in order, but even if you don’t, you might still be ready for a change.
Ask companies to include all details in writing. Although that sounds simple enough, too many contractors submit offers such as "paint house for $5,000." A friendly contractor may offer a reassuring handshake and promise that the crew will take care of all the details — starting on time, working every day, cleaning up, etc. That's great, but why not include each point in the proposal? If it's a challenge to get a written description of labor, materials and other details, things will probably get worse when the work starts.
When the homeowner is at the point of hiring a painter, they generally will have colors selected or at the very least a color in mind. I always ask for the colors before I bid a job. Dark colors, high sheen colors and specialty finishes require more labor, this drives price. If its not a color change or I'm going over a similar color I give the pricing option of one or two coats. The best advise I can give based on 25 years in the business is to put it all in writing,colors, brands of paint preferred, when the work can be done, who moves furniture and how payment will be handled. I never get up front money. BTW you most definitely get what you pay for with paint. Higher quality products results in and better looking job. Don't be a cheapskate when it comes to paint or the painting contractor.
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.