Should I use GREY or white primer? —For covering up walls that are dark, or rich in color, a gray colored primer works best. This hides the tone of the color underneath best. With a white primer you will need 2-4 coats of primer, to cover blacks, and reds.
Does the color of primer matter? Some say the primer color does not matter, and it doesn’t if you put enough coats over it, but that can get costly. Matching primer to the color you want will result in having to apply fewer coats. Primer is a coating that prevents rust and provides a base for the paint you will apply.
What is white primer used for? Primer is usually white but can be other neutral colors. This is to provide a neutral surface to ensure that paint colors show true. There is no need to color the primer itself, but some paint stores will add a small amount of pigment to the primer to make it closer to your final paint color.
What color is best for primer? If you’re painting them dark, black is better. If you’re painting them light, white is better. If you want to be a little safe, gray is good. But one bit of advice: If you’re painting a mini with yellow paint, you absolutely 100% want to use white primer.