If your home was built before 1978, there is a good chance that lead paint was used in its construction. Scraping, sanding, or removing old paint can release toxic lead dust which can cause serious illness in children and pregnant women. Special handling is required when working with lead-based paints. If lead paint is present in your home, you will need to hire a lead-certified painting contractor or lead abatement contractor. Before getting started with your exterior painting project, consult your local building authority or visit www.epa.gov for more information.
Painting professionals might charge more or less to paint your home's exterior based on its construction material. Some materials cost more to paint than others because of their texture, the paint required to properly cover them, and whether specialized materials are required to prepare them for painting or the elements. Find more information on the various types of siding available, as well as how much it might cost to paint or prepare each.
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.
As any painter will tell you, prep work is just as important -- if not more important -- than the paint application itself. If the paint on your house is chipping or peeling, it needs to be scraped and sanded smooth before applying a new finish. In most cases, you won’t need to remove all the existing paint, but scraping, sanding, patching, caulking, and priming are critical steps that take place before the start of most exterior painting jobs.
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.
Also, don't be afraid to ask if the painters are trustworthy people. Unfortunately, there are plenty of cases where a painter has stolen items from a home or caused damage to the house or injury to the homeowner. Subcontractors may not be as skilled as employees, and the contractor you're hiring may not have much experience working with them, making them more of a risk. Additionally, ask if the painters are employees or subcontractors, and what the screening or hiring process is like. If the company conducts background checks, that's a good sign. 

PSA: Color psychology is a thing. The right soothing hue can work wonders for your mind and soul. You might think that only works for pale blues, but the contrast of a light and dark color — or, in this case, off-white walls with chocolate brown and deep blue accents — has a powerful effect. "The darker color grounds the room, and then the lighter runs right up to the ceiling and makes it feel higher. It creates this serene atmosphere," designer Laura Bohn told us.
Filling gaps with a paintable acrylic-latex caulk cuts down on drafts and makes your trim look better than new. The secret to using caulk is to cut the tip smaller than you think it should be; too much caulk makes a mess. Also, instead of using a nail to break the inner seal, use a small wire so you don't stretch out the nozzle. Also consider buying a dripless caulk gun, which will automatically back off the pressure after each pull on the trigger to prevent unwanted oozing.
"Modern paints dry too quickly, and are difficult to brush out," says Dixon, who uses paint additives, such as Floetrol for latex paints and Penetrol for alkyds. "Adding a few ounces per gallon slows drying time and makes the paint more workable," he says. Another problem is bridging. "Latex paints form a skin," says Dixon. "Removing painted tape can tear the skin, resulting in a ragged rather than a sharp line." Lastly, taping takes time. "Learning how to cut in with a brush takes practice, but if you can do it, you'll leave most tapers in the dust," Dixon says. (Cutting in is painting just the surface you want, not the surface adjacent to it — for example, where a wall meets the ceiling.) Although there are mildewcide additives, our pros prefer using bathroom and kitchen paints that have built-in mildew fighters. "These paints will prevent mildew from forming, but they won't kill mildew that's already there," Dixon points out. Because leftover mold spores can live beneath the paint and eventually work their way through to the surface, you should also prep bath and kitchen surfaces. First, wash down the walls with a bleach solution (3/4 cup of bleach per gallon of water) then seal with a stain-blocking primer, such as Zinsser's Bulls Eye 1-2-3 or Kilz's Total One.
"I hired Medina to complete a restoration and paint job for the outside of my house. They were very fair in their pricing and did an excellent job. My GC was skeptical that they could do a good job considering the scope of work and the price given. Mr Medina completed wood replacements, facia restoration and complete outside paint job on time and within budget. He suggested additional restoration during the project and his recommendations were on point and didn’t add much to the cost. I couldn’t be happier and my GC asked for his business card after inspection. Will use again when I can complete the concrete work. Thank You *****"
Every home has details that can be accentuated for amazing looking visual appeal and first impressions.  The key is to not make the wrong details stand out.  Entryways, windows, shutters and other details on the home can be painted to make their design noticeable.  However features such as gutters, downspouts, external air conditioning systems, unevenly proportioned windows and protruding garage doors should not be completed to draw attention to them as this will provide a negative results.
If less than half the old paint is left, however, it may be worth stripping it all off. Guertin gets rid of stubborn remnants using shrouded grinders (like the PaintShaver), infrared paint strippers (such as the Speedheater), or chemical strippers (like Multi-Strip), then smooths the wood with a course or two of sanding. When siding (or bank accounts) can't take the shock of a total strip job, Rich O'Neil, of Masterwork Painting in Bedford, Massachusetts, has successfully hidden rough, well-adhered paint under Peel Bond, a thick primer.
Pros prefer 5-gallon buckets with a roller grid to roller pans. They hold more paint than pans and, says Doherty, "It's tougher to tip over a bucket." A bucket also lets you box, or mix, two or three cans of paint to avoid color discrepancies. To use a bucket and grid, dip the roller a quarter of the way into the paint and run it over the ramp to work the paint into the nap. 

Unless you like textured walls, don't paint over dust. Wash the walls with trisodium phosphate (TSP) or a mild cleaner, like Jasco's TSP No-Rinse Substitute. For smoke-stained walls, Toto uses a 50/50 solution of bleach and water. To clean a wall, use two buckets. Load up your rag or sponge from your cleaning-solution bucket, and scrub. Before redipping, rinse the sponge in a second bucket filled with clean water.
Thanks, all, for your time & efforts adding to the article & comments, especially Dave urging requesting both General Liability AND Worker Compensation insurance certificates to protect from real & fraudulent liability--from my experience especially in California, where insurance fraud is a popular income thief, even causing car collisions to collect.

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!

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