I don't have a garage or a carport and was wondering if car covers are any good?

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DO IT ONCE, DO IT RIGHT

Yes, provided you buy a decent cover.

If you do a search, you'll find a few threads on this.

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One should never skimp on the zip ties.

Don't park on grass with it on though. You'll get condensation underneath the cover.
might be ok if it breathes really well.... better than mine did.

I have had one made by a professional Car cover maker, its fits like a glove and is weather and waterproof, but not enought to stop it breathing, it cost me $145 and I am more than happy with it, no metal just all velcro, great job and protects the car well.

If you want the address, she is here in Vic, but will post anywhere, PM me and I will supply it to you.

She lives at the end of the Monash Freeway, dandenong end.