ORIGINAL: SoCalSal
Quit using that plastic covering. Go to a fabric of some type. I myself use Stits Polyfiber . It is about the same cost per square foot. But it never wrinkles and adds a bunch of strength to your airframe.
You can find it at F&M enterprizes.
I would love to as these are my planes that I did in Solartex. However, with small scale (40"WS), fabric is too heavy. DP