I do a lot of brushed finishes, and I have found that some colors smear easier than others. The greens and blues seem to be the worst for me. What I do is thin the clear at least 60% or more, and start by brushing right down the trim lines without going across them. I only brush back one time using a 2 stroke with the brush. I try not to go back over freshly dope areas. After the cleared trim lines are a bit dry, I go ahead and do the rest of the plane being carefull to not brush over two to three strokes. Another trick that works pretty well is when you still have your masking tape on and have just done the the trim colors, go over the trim with clear before taking the tape off. That way you will have a coat of clear over the trim already and will lessen the chance of it bleeding onto the base color. I think the most important thing is to use thin dope and do not use more than three brush strokes with the clear. Simple trim schemes also make it easier like on this Magician. There is a learning curve to brushing, but you can do finishes that will rival a sprayed job with practice. I hope this helps.