Paint your entire model in white acrylic paint. I like to dilute my paint with some water so it goes on smoothly. This step may require more than 1 coat. When I cannot see the model's original color is when I move on to the next step.

This is only my 1st coat of white, I think I will have to do about 1-2 more coats until the black is covered up.

I forgot to mention that you will also need matte or glossy finishing spray to protect your model after it is completed. This is the last step, do not use it until you are100% finished with your model.