It is rarely a good idea to use ailerons as flaps (unless they are used in conjunction with separate flaps and the ailerons have less flap movement). The reason is when you happen to get near the stall and try and pick up a low wing, the aileron will stall dropping the wing further. Stalling the outer portion before the inner section of wing gives less warning of impending stall. On the other hand if you use flaps and flaperons it can work well as long as the main flaps extend further than the ailerons (creates a washout effect). Many full size aircraft have used this feature to good effect.
Cheers