Touch up paint

PS it was real car paint that was used. Not a lesser quality.

I never heard of a paint that was not permanent. As with any paint of any quality, it adheres based on the surface prep. None will stick to oil, wax, or products containing silicone. Regular car paint is applied over layers of sealers and primers. That's what body shops do to produce superior results. Touch up paint in little bottles are designed to work on small areas without needing separate primer applied first.