Mixing milk paint is a simple process using equal parts powder to water.  The mixing process takes about five minutes, using the following steps:

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The mix is very simple:
1 part water to one part powder. 
Use whatever size scoop you want. 
Here I used a 1/4 cup.
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Add water to the cup first.
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Dry your scoop and add the same amount of powder to the water.
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Gently stir in the powder, thoroughly mixing.
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We did not add any “Anti Foam” to this paint, so you may see some bubbles. 
They will settle out more the longer the paint sits.
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Real Milk Paint has a lot of pigment, but when going over an old finish for the first coat you will see some transparency. Give a second coat when the first coat is dry.
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Here is a tip from Kelly of Furniture from the Barn:
I like to mix my paint two days ahead of time, then put it in the refrigerator. 
This makes Real Milk Paint very smooth and creamy.