RE: Monokote or Solarflex
I have no clue as to what SolarFlex is and it's connection to model airplanes
The different transparent Ultracote colors or clear would be my choice for a park flyer.
Monokote transparents weigh less than solids
TowerKote and Econokote covering weighs less than Monokote
SolarTex is a coated dacron fabric that is too heavy for a park flyer