Great ideas from everyone.  Thanks for your time.</p>

 I am overlaping the two colors by a minimum amount to save weight on this model.  However, after reading the different ideas posted here, it occured to me that on something as small as the rudder that I can cover the entire surface with yellow and then apply the small amount of blue on top by using just enought heat to activate the adhesive but not shrink it.  That will add only an insignificant amount of weight.  I also like the idea of using a small amount of balsa backing (also an insignificant amount of weight.).  Or, perhaps both, with little adverse affect on weight.</p>

As I said, it will be at least two weeks before I can work with it again, but when it do,  I my try several different techniques on scraps just to see what works best.  </p>

I first wrote the question so that I could save time and material, but now all the ideas have me wondering which might work best.  </p>

I'll post later and let everyone know which technique I used and how it worked out.</p>

Thanks again.</p>

Greg</p>