When we were down to the last minute getting this car painted for the VRAA last year we used a 2 inch piece of masking tape to cover the already painted white nose that had a 10mm hole punched in the middle of it. We laid out the masking tape with the hole in the center of the body, rolled the tape around the nose and then shot it with some bright red paint. It took longer to find the hole punch than it took to paint it on.
There is a tool you can get at art shops that is like a drawing compass but with a knife at the end. You can then make the red sun from a solid red decal sheet. The dot in the middle for the compass pin head will disappear.
This is how I made rondels for numbers (but in white of course)
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