If you are going to hire a contractor (professional painter) give a room by room punch list of the fixing of holes small or big, have it identified for the painter to tell you if you need a drywall finisher or if he does this type of work good. Wall repairs can be 3-5 steps to do repairs ( one per day for good drying of patching material and a good sanding) this is what gives you a good paint job only using high quality paint.
The companies with the best paint products are Benjamin Moore, Dunn Edwards, Sherwin Williams, and Vista Paint. As a painter I don't recommend Berh from Home Depot as much because it's quality is just marketing. Flat paint has no sheen and it shows its true color, but is not easy to wash or clean. Satin, eggshell have low sheen and is washable. Semigloss ang glossy has a high sheen and these paints are recommended for bathrooms and kitchen or where there's high humidity and steam.
we only use the best interior paint which goes further as far as pricing a repaint we charge 2.00 a square foot floor space for walls ceilings and trim .on new construction using the best paint 3.90 per foot floor space that is with 3 coats on all surfaces but as being a professional for 45 years i recommend use a professional so that your paint will last longer and you wont have to pay to have it done more often i do free consulting in these areas i am more than happy to assist you with your projects 864-506-6666 just always remember good paint last longer and use a washable paint your home is your most valueable investment take care of it
I do not mean to come off with an edge, however, this is an article for people hiring low bid, uninsured, one man band painters out to "hustle" a buck. Hire reputable, established companies or hire someone you know or have a strong referral from. If you are arguing over watered down paint, ticky, tacky deposits, buying your own supplies, you have hired the wrong guy.
Paint will be your next-biggest cost, at anywhere from $20 to $70 or more per gallon, depending on the sheen, the grade you’ve chosen and any special features. Some paints, for instance, are mold resistant. Others suppress smells or require fewer coats. Some have a lifetime warranty. Paints with warranties, however, may not be worth a higher price. In Consumer Reports tests approximating nine years of wear, only a few exterior paints and stains with lifetime warranties held up well. But “you’ll grow tired of the color long before a good-quality paint wears out,” Bancroft says.
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.