The outlines will be visible. With professional buffing they will be less visible for a time after each buffing and will eventually be less noticeable. We removed the decals from our 2008 Montana about 5 years ago and I (non-professional) used several products guaranteed to make the ghost images go away. Nothing worked for more than 6 months to a year. The longer the RV sits out the sun will eventually almost even the gel coat out.