The 3M website recommend the following;
"Maintenance and Removal
Q.Will Scotchgard™ Paint Protection Film harm the painted surface if the film is removed?
A.If Scotchgard film is properly applied to a fully cured painted vehicle, it can be removed, usually in one piece, without damaging paint surfaces beneath the film.
Q.Can Scotchgard™ Paint Protection Film be applied over a vehicle that has had the paint touched up?
A.3M recommends that any repainted surfaces on your vehicle be professionally painted and fully cured before applying Scotchgard film. If you have touched up scratches or chips with a tube of "touch-up" paint and then apply Scotchgard film over it, the film will protect that area until it is removed. If the Scotchgard film is removed, it is possible that the area around the non-professional touch-up paint could peel off.
"Q.Can Scotchgard™ Paint Protection Film be applied over a newly painted vehicle?
A.The paint on a newly painted vehicle must be fully cured according to paint manufacturer's recommendations before installing Scotchgard film. Your body shop should be able to provide you with this information."