If you plan to store the car outside for a reletively long period of time (especially coming up to winter) it may be worth considering something like the following:

http://www.hamiltonclassic.co.uk/ProductInformation/AutoPod.htm

I have previously used their car-o-port in a semi open carage (2 sides open) for 2 years.

By not touching the paint you save the hastle over possible scratches...