Why is it always recommended that you painting something, waiting for it to dry, paint again, repeat repeat, instead of just doing it once and add enough paint on the first go?
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It’s easier to get a thin coat to be even than it is to get a thick coat applied evenly. If you put on a thick coat, the excess will follow gravity, and you’ll get some nice drips. To prevent that, just apply a few thin coats.
You get better coverage doing two thinner coats then trying to slap on one thicker coat. Supposedly multiple coats lasts longer as far as looking pristine.
A thin coat of paint dries quickly. A thick coat takes longer, and may have drips and runs in it. It’s better to cover with repeated things coats because they can’t run before they dry. Also, between coats you can see which areas need more coverage.
it depends on the paint, and the texture/type of wall you’re painting. adding enough paint to cover all areas might end up with a heavy streaky look. you want to use the least amount of paint to cover the area, but water based paint can also have problems of not adhering well to the wall (that’s why they say to clean the wall first, but no one really does that unless it’s obviously dirty). so if this happens, then when it dries, you either have heavy streaks or patches leaking through from the previous color. so having a second coat will fill in the gaps. there are brands of paint that advertise one coat, and they more or less work to a certain degree.
You want the paint to be thin enough that it will get into every nook and soak into everything. However when you do that you get a very thin layer of paint which will be easily worn down. So you need to paint it with several layers expecting it to wear though some of them. You do not want to paint the next layer before the previous one have dried because you will just peal off the paint from the first layer and end up with a much thinner coat of paint. On the other hand you might not want to wait too long as the paint sticks best when it is almost dry so the layers stick to each other.
If you make one thick layer ot paint, it won’t dry. The moisture on the outside will evaporate and the paint will harden which will leave a gluey and wet inside. But one thing layer of paint usually doesn’t have enough pigment or volume to evenly spread out along a surface.
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