Prep. For new work the painter accepts the finish done by the drywall or plaster and once he accepts the work and starts painting he owns any wall repairs. Existing work is a different thing. I take a high intensity light and circle the kinds of defects with chalk so we are all in agreement before they start. Sometimes this results in a higher price and we have to compromise on how much to do...
Small random-orbit or pad sanders make this job go faster. (Wallis first covers these boundaries with Synkoloid patching compound so no edge is visible after sanding.) As shown, you want to make sure that there is a feathered, smooth transition from exposed wood to old paint. For areas that might get close scrutiny, you can follow up with a 100- or 120-grit rubdown to erase any scratches.
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.
• One room or the whole house? Applying one coat in one room is a reasonable DIY Saturday project (especially if you have help and beer). Multiply the time spent moving furniture, prepping walls and sanding old trim by the number of rooms in the house, and you might want to hire real help. It's the same outside. You can probably tackle one shady garage wall that needs a little scraping and sanding plus a coat of paint, but covering all surfaces of the house is usually best left to a pro.
We had a bad experience with an interior painter years ago, with the crux of the problem being him overcharging us at the end for "extra work" he didn't anticipate. One thing I'd strongly recommend is making sure it's in the contract that any additional work or growth work is estimated and communicated to the owner as soon as it is identified, otherwise the owner is not liable to pay it at the end.
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WOW! I think the guy I hired read this first and I have photos that would make your skin crawl. Bottom line: he got me for $1900.00. Every single thing he painted had to be completely redone....that's when I discovered he did NOT use the colors I picked, he actually used leftover exterior paint from his mother's house! Because I have pets he said things needed to be sealed first and I did agree to that. What I did NOT agree to was using some kind of foul smelling gray stuff ON MY HARDWOOD FLOORS! THEN he painted them BLACK, telling me that all they were good for was covering over with laminate or carpet. He also dripped and tracked paint all over my ceramic tile floors. PLUS left a wet used paint roller in my garden window and had stuff piled in front so I didn't find it until it had dried. I have no idea how much that is going to cost to repair. Then he left without finishing (thank God) but left the "leftover" paint, uncovered, in the rain. Again, hid it so I didn't immediately find it. Obviously we will be going to court but I doubt if I see a penny from him.
Did you even read the article? It was specifying UNSCRUPULOUS painters! And, by the way, the photo at the top was not identified at all. How would anyone know whether it was done by a homeowner or not? Also did you ever stop to think that if a consumer has the knowlege to spot a dishonest contractor then by default he also has the knowlege to identify an honest one as well? And, pardon me, but just because you've never seen something has absolutely nothing to do with whether it has actually happened to someone else. Why would any honest business person be so defensive about the publishing of such useful information? If any painters/painting contractors object to a consumer having this kind of information maybe they are the dishonest ones!