i dont know what that covering they use is made of, but that polycote ecs stuff is really crap. it looks great and it is very detailed, but man, that stuff is so weak that when i pivoted my wing while i was replacing the ailerons that were way too small for my cap 232 anyway with bigger ones, my big toe went right through it. i did not kick it, nor do i have sharp toenails. it just went through as i pivoted the wing around the center of the aifoil to soak the other side of the ca hinge holes.