It would be ideal to choose a primer in the color of the paint — this will significantly help reduce paint consumption. To do this, you can add a small amount of paint to the primer and then the applied layer of the primer will give the surface the shade of the selected color. But this method is only suitable if the Eurobody is planned to be painted in one color. For decorative coloring, you should not interfere with colors, since in the end you can not predict everything 100% of which result.
