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Covercraft Weathershield HD or HP. Pricey but worth it.
Thanks Hoi. "Pricey" you say? Right on ($500+). Made my eyes bleed! LOL. I don't doubt the quality but I'd prefer a price range that only made my eyes get very wide. 8-)
I have been using car covers from costco for years. They are cheap ($30!) and work well. No outdoor cover should prevent moisture from getting through. If it did, moisture also wouldn't get out and your car would often be wet from condensation. If you want 100% waterproof just use a blue tarp...but I wouldn't recommend it!
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Shop around and you should be able to find one for less than $500.
Originally Posted by johnu
No outdoor cover should prevent moisture from getting through. If it did, moisture also wouldn't get out and your car would often be wet from condensation.
In the 1940s this was true.
However not too long thereafter it wasn't.
There are numerous "one-way" fabrics and several are used for car covers. And they work pretty well.
I bought a Coverking Autobody Armor Outdoor Cover when my 928 Spyder project was being worked on by 928MS and it had to sit outside from time to time. Very nice quality and did a good job of protecting the paint. Because my car is a drop-top, it's actually the cover for a C4 or c5 converible, as it has almost the exact same dimensions. They are sold by AutoAnything and those guys almost always have an active coupon for 15% or 20% off an online order.
If you really want to go top of the line, the absolute best solution is the Car Capsule - http://carcapsule.com/
For what its worth: I've always heard pro's and cons to flannel on the underside of the car cover.
Sounds good at first glance.
But, flannel holds dirt and grit, so you have to wash the car and only apply the car cover to a clean car. Or the grit gets in the flannel and will scratch the paint every time the wind blows. Then there is the issue with the flannel holding moisture, causing (some say) water spotting to the paint.
I have no dog in this hunt - we sell both flanneled and non-flanneled. Like them both, we use them both; flannel lined if the car is clean, non-flanneled if the car is not..
For what its worth: I've always heard pro's and cons to flannel on the underside of the car cover. Sounds good at first glance. But, flannel holds dirt and grit, so you have to wash the car and only apply the car cover to a clean car. Or the grit gets in the flannel and will scratch the paint every time the wind blows. Then there is the issue with the flannel holding moisture, causing (some say) water spotting to the paint. I have no dog in this hunt - we sell both flanneled and non-flanneled. Like them both, we use them both; flannel lined if the car is clean, non-flanneled if the car is not..
Flannel-lined or other 'soft' covers are great for dust protection for indoor storage. Thicker 'soft' covers can offer some minimal protection from minor impacts that might leave scratches.
But, they're not suitable for outdoor storage because of moisture entrapment.
A good 'dual-use' cover is a "Noah" fabric cover. It's water resistant but breathable and of medium thickness.
The Weathershield cover is almost 100% a one-way fabric. Water will bead off of it. Only in a heavy rain will it absorb water. It dries very quickly and doesn't trap moisture. It's also thin and very light so abrasion damage from wind is minimized. (Of course, you should make sure any outdoor cover is tied-down well to minimize movement.)
The Weathershield cover is also very washable and doesn't degrade quickly with washing. The thicker covers degrade when washed and after the 3rd or 4th wash are either super-thin and falling apart or no longer suitable for outdoor use if they are dual-use fabrics.
When I need to store 'the fleet' or a portion of it outdoors the special cars get a Weathershield cover over a Noah cover.
During the winter I use the Weathershield covers over flannel or even softer indoor covers. 'Spare' Noah covers are used to cover customer cars from dust or the minimal possibility of a scrape or ding.
Since the Weathershield covers are washable they are allowed to collect dust while keeping the indoor covers totally clean.
Agree with everything Dave C is saying about the covers. Advantage I find in Weathershield HD is also that it is home washerable, whereas Weatherwhield HP is commercial washer only. I purchase both a Weathershield HD and a Covercraft form-fit and use both if I need to store a car outside for an extended period of time, like Dave.
Autogeek or Autoanything sell Weathershield HD for 470 and form-fit for ~250-260.