Well, when the wing blows up enouth that they pop, you get to cover them with a diffenent color that you really wanted in the first place

Joking aside, the wings don't fillup like a ballon. Rember that airflow over a surface results in a drop in pressure which translates to lift. There isn't going to be a build up pressure in the wings, but rather a vacuum. If there was a hole in the leading edge that could ram the air into the wing, it may cause some balloning. Seeing as the servo arm exits are well back from the spars, this just isn't going to hapen.

Don