how do you mask circles on a model plane?
I am making a model tiger moth, and on the camo scheme, it showes that the bottom half of the airplane is yellow, and the top half is a green and brown camo. however, one of the circular decals go half in the yellow and half in the camo scheme, but the circular decal has a yellow brder. ( easier to just look at the pic) anyways, since i did a base coat of yellow, and i masked it off to paint the camo. so how can i mask of a perfect circle?