Shouldn't be an issue at all. Any new panel should be treated with Waxoyl as par for the course.
As a result of that I always put my car in gear when I park it (however then you risk trying to start it when in gear and leaping forward into another immovable object!)
Why would you not use the handbrake Roy out of curiosity? Just no need?
Ouch. Gutted. I'm sure it's already been said but, leaving it in-gear FTW. On all but the steepest of hills, this should hopefully save you in the event of a handbrake failure. I never even use my handbrake for normal parking. I pop it in first and apply the HB only if it's on an incline.