Re: Repairs in space
From what I remember, that little soccer ball sized droid used fans to move around inside the ISS. In that form, it wouldn't work outside in a vacuum. You'd need to add propellant tanks and thrusters (I'd suggest nitrogen) to move around outside.
Once there, once you started to dispense any foam, you'd need to constantly fire the thrusters to keep the droid in place (action/reaction). There isn't anything to grab onto on the underside of Shuttle.