The most popular way to make your Gundam look its best is to paint its detail lines.The popular consensus is that you should line with a color and darkness relating to the plastic you're working on. For example, when lining on white use a light gray. For medium colors try a darker gray, and on dark or somethings vibrant colors use a black. If you're lining with paint try to mix in portions of the base color for a subtle effect. Remember to try different things and go with what you think looks