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Before you apply the milk paint, you need to make sure that the surface you are painting is smooth and ready to receive paint. If you are painting a wall, remove any nails or fixtures sticking out of the wall. If you are painting a piece of furniture, sand it so that the surface is smooth. Milk paint can be used as soon as it is finished being made. Before you use your milk paint, stir it well with a large spoon to make sure that all the ingredients are blended. Stirring is especially important if you have let the paint sit. If you are worried that the paint won't stick to the surface, add a measure of acrylic binder to the milk paint. Follow the instructions on the container to determine how much to add. Use a bristle brush or a foam roller to apply the first layer of paint all over the surface you are painting. Don't run the brush over the same area of paint too much, or it will leave large streaks. Use a bristle brush if you like the look of antiqued finishes where you can see the faint lines of the brush. If you want a more uniform finish, use a foam roller. Wait from an hour and a half to two hours to let the first layer of paint dry. If you begin to paint before the first layer is finished, the paint job won't look clean. Before you paint the second layer, give the milk paint a stir to make sure that the ingredients haven't settled or separated. Then apply the second layer of paint. Two layers of paint is often enough to coat a surface. If the paint job looks thin or you can still see the surface underneath, wait for the second layer to dry, then apply a third layer. Depending on what you are painting, you may wish to apply a topcoat. You can use any kind of topcoat you wish over milk paint, whether it be natural or acrylic/urethane. A topcoat helps to protect the paint job and can add a finish like a varnish, shellac or gloss. Put any leftover paint you may have in the fridge. You can keep milk paint for up to three days if you store it in the fridge. However, because the paint separates, it's best used while fresh.
Prepare the surface you are painting. Stir the milk paint. Apply the first layer of paint. Let the first layer dry. Stir the paint and apply the second layer. Apply a topcoat if desired. Store milk paint in the fridge for up to three days. Finished.