If you live in Great Britain near by the sea and have a car that is not galvanized you probably fear rust.
Not everyone has the time or ability to put the car in the brick builded garage, although it would be the optimum.

A portable garage – a tent can be a fine opportunity to get the car protected and placed in shelter safely stored both in summer and winter.

A storage shelter come in several designs and colours for both larger and smaller cars.

Portable garage PRO 6 x 6 x 3.7 PVC
Portable garage PRO 2.4 x 6.0 x 2.4
Portable garage 2.70 x 5.10 x 2.30

It is not only the car but also the boat that can be well covered in a portable garage. Dancovershop has a serie: Ocean cover, as with 500g/m2 PVC fabric and strong titanium-quality pipes are among the strongest on the market.
The price is even reasonable for this high quality product.

Take a look at Dancovershop.com homepage for Ocean Cover