If you are going to be covering an open area (built up wing,etc.) the best way is to make a skin first. I make skins over glass using the same overlap as above. Put the first color down on glass that you have first sprayed with a little water, squeegee out all bubbles, then do the same with the next color (you can either use a sealing iron to join the seam or put a very light coat of No Heat or similar solvent on the first color and then lay the second one on the seam and squeegee out bubbles (I like the sealing iron). Continue this until you have the skin complete.

Practice on something small.