I don't leave mine outside at home, but in the distant past when I used to live in the wilds of Scotland I used to keep my MX5 outside all year round (from new). I had it five years and it never had any kind of cover on it.<br>It was fine but I would advise that you keep up with the cleaning and waxing/protecting of not just the paintwork, but also the roof and rubber seals etc...<br>If you don't properly clean, condition, and protect the roof fabric and stitching, it will green up and degrade sitting out in the damp 24/7.<br><br>Tip: Have a small cloth handy when you open the boot lid if the car is wet....If not, you will drip water into the boot as you open it up....Small detail, but at least you are forewarned.<br>