Like this, it will actually take quite a while to reach a number that is close enough to the yellow color you've chosen that you can't tell any difference (and mathematically, you will never actually reach an average of 4!)
A good interior paint job is often 50% preparation and 50% painting. Do not rush in preparing the surfaces in your eagerness to get at the brush or roller. If you do not prepare the surfaces properly, you'll be back with the paint brush or roller in a few months.
THE BRUSHWORK. Depending on the art movement and personal peculiarities of the artist, the brushwork can range from delicate and almost invisible to rough and plastic.
Solvent or oil-based paints are used where a tough, durable finish is required for interior and exterior timber, masonry and furniture - although, as mentioned above, the new generation of acrylics and multi-surface paints offers viable alternatives. In general, brushes need to be cleaned with turpentine or white spirit.
Painting ceiling does not require premium paint. You can use flat $15 to $20 ceiling paint. I use Sherwin Williams PRO-MAR 200. Painting ceiling requires a lot of physical work and plenty of drop cloths. If you are not up for the challenge or have very high ceilings contacted a professional will prove to be a smart move.
Pick a brand you can trust Companies with their own high-street shops, such as Fired Earth and Farrow & Ball, and those that sell through the DIY giants are the most accessible. However, buying paint online is increasingly popular and can bring you a wider choice, especially if you live outside major towns and cities.
Can you get a good paint job from a low buck paint shop? Yes! Professional paint pros and high dollar restorers may scoff, but it's very possible to get a good looking, long lasting paint job from a discount paint shop like Earl Scheib or Maaco. It's not appropriate for every car. I wouldn't hand them the keys to my Shelby GT500 or '53 Corvette, but for those on a budget it's a very good option. The key to a successful budget paint job is to prep the car yourself. Leave nothing to the shop except actually laying down the paint. (note: For purposes of discussion we'll use a classic Mustang as the example, but this process holds true to really any older car)