How Much Is One Part

What does it mean to mix a part in paint? 3

I'm going to paint, but I don't know what they mean, for example the colored part and the wet part, how to measure or what it means?

Half is a scale you define, where two or more things being measured are the same amount.

In your case it would be a mixture of the same size of paint and the same size of reducing agent, then half and half.

How Much Is One Part

First of all, if you are using 2 parts paint for painting, then this use is not for you. They want the shiny latex or sheen you want. 2 parts paint for steel, such as car or heavy equipment etc. One portion means one or half portion 2. Mixing portion with gallon or cup. The amount depends on your need. Two-component paint has a processing time of about 15 minutes, dries under water or in a spray-on-steel process.
Part means size. For example, if you use a measuring cup and put some paint in two waters, you will mix one cup of paint and two cups of water. The same thing applies with cans, cups of tea and gallons. As long as it's the same. Dude, I see you're not that stupid ...
Per serving means one of 2 (or more, depending on the recipe) equal parts, in fact there is no standard weight scale. This is more for your needs. If you need one gallon it will be 1/2 gallon paint and 1/2 gallon muffler, or if you are going for good detail, 1 ounce paint and 1 ounce muffler.
You decide what the job represents based on your personal needs.
For example, if you only need a small amount of paint, add a paint cup and a buffer cup. Or if you need a lot of paint, add 5 gallons of paint and 5 gallons of thinner. Or in the midst of it all.
This means that 1 can of paint and 1 can of silencer will become 2 cans of the resulting mix.
Where
One dose of paint and one dose of thinner to get 2 doses of the mixture.