A good tip to remove over spray is to use what's called a car detailing clay bar. If you are into 'detailing' your car as opposed to just washing it, you'll know what a clay bar is. Its a little expensive to buy so if you know someone who details their car, ask them for some that they were going to throw away.
Basically detailing clay is like a sticky putty. You use a lubricate or water on the car body then rub the clay back and forth to remove tar spots, brake dust and automotive spray paint! It should work on ordinary enamel or acrylic paint on a hull.
The area to be clayed should be ket wet. Wet your hands to stop the clay sticking to your fingers. With light pressure, move the clay back and forth across the area of overspray. if the clay 'grabs' the hull, add more water to the area. As the overspray comes off, fold the clay onto itself several times, apply more water and rub again. when you've finished, the overspray should be removed and the remaining paint will feel super smooth to the touch.