It;s also a good idea when covering from scratch to have "all seams" facing away from the airflow... This takes some planning... especially on the wing but it can be done...

For example.. I cover the bottom first.. then the top piec will roll over the leading edge  top and back under the bottom such that the seem is facing away from the motor.  On the back side.. you would need to roll the bottom up and over the trailing edge. and let the top piece lay on top of it again so the seam is facing away from the motor.  On the fuse.. all seams are facing downward.. start at bottom , then sides. .then top.  Seams blend in more as well this way. I only try to use ultracote as it;s thinner with no reduction in strenght that I can tell.. and the seam "bump" is almost non-existent.