<VV> Car Covers & Condensation

Tue Mar 10 14:44:54 EDT 2009

Agreed - the interior of the valances, doors and other hollow box sections 
are almost always moist when the temperature changes (also independently of 
dew - this can happen with cars stored inside, and does, here, very often).

I have taken photos through holes in sections we are repairing, and it is 
fascinating to see what is happening inside the box sections. And with a 
flash camera you can take photos that show things you can't see by looking 
through the hole, even with a very bright light.

Cheers

Alan

----- Original Message ----- 
From: "BBRT" <chsadek at comcast.net>
To: <virtualvairs at corvair.org>
Sent: Tuesday, March 10, 2009 6:40 PM
Subject: <VV> Car Covers & Condensation

> "Condensation on a surface results in dew formation when the near surface
> air temperature drops to the dew point temperature. The dewpoint is the
> temperature at which the air is saturated with water vapor. Accumulation
> will be heaviest on exposed surfaces, so using a car cover as a protective
> barrier could be helpful"
>
> See a discussion of dew point and condensation or frost.
>
> http://www.shorstmeyer.com/wxfaqs/frost/frost.html
>
> Much rust occurs from underneath a surface. If you look at newer cars, 
> they
> do not have an exposed surface that water can form on, like under a house
> rain gutter. The LM front window "sill" valance has such a surface and is
> prone to condensation and rust.
>
> Chuck S
> BBRT
>
>
> ----- Original Message ----- 
> From: "Alan and Clare Wesson" <alan.wesson at atlas.co.uk>
> To: "Ron" <ronh at owt.com>; "mike hicks" <mhicks130 at cox.net>;
> <virtualvairs at corvair.org>
> Sent: Tuesday, March 10, 2009 2:29 PM
> Subject: Re: <VV> Car Covers
>
>
>>I am prepared to take your word for it, but personal experience indicates
>> otherwise! I have had several very unfortunate experiences with
>> micro-blistering, on cars that were left outside in *dry* but dewy
>> conditions, and because extremely micro-blistered where the cover was in
>> contact with the paint. When I removed the cover the contact surface 
>> where
>> the cover touched the paint was wet, as were various places under the car
>> where the moisture could only (apparently) have risen.
>>
>> And I have just done a quick web search on the subject, and the best
>> explanation seems to be that dew is formed from moisture that condenses
>> from
>> air close to the ground, as the ground has harboured heat in the daytime,
>> so
>> when night falls the vapour nearer the ground condenses more.
>>
>> That in itself strikes me as a good reason to avoid car covers, because
>> the
>> dew is going to be condensing under your car where it is near the ground,
>> and wetting it (this is certainly what happens). So whatever the cause of
>> the dew (and I'm prepared to believe what you say about dew, and I stand
>> corrected) I still wouldn't touch a car cover with a ten foot pole, 
>> except
>> a
>> dust cover on a car kept in a very dry atmosphere.
>>
>> Cheers
>>
>> Alan
>>
>>
>> ----- Original Message ----- 
>> From: "Ron" <ronh at owt.com>
>> To: "Alan and Clare Wesson" <alan.wesson at atlas.co.uk>; "mike hicks"
>> <mhicks130 at cox.net>; <virtualvairs at corvair.org>
>> Sent: Tuesday, March 10, 2009 6:17 PM
>> Subject: Re: <VV> Car Covers
>>
>>
>>> Wrong, wrong, wrong!  Dew comes from the air and if you're a skeptic,
>>> check with Wikipedia.
>>> RonH
>>>
>>> ----- Original Message ----- 
>>> From: "Alan and Clare Wesson" <alan.wesson at atlas.co.uk>
>>> To: "mike hicks" <mhicks130 at cox.net>; <virtualvairs at corvair.org>
>>> Sent: Monday, March 09, 2009 11:40 PM
>>> Subject: Re: <VV> Car Covers
>>>
>>>
>>>> Watch for those micro-blisters - and don't forget that dew comes *up*,
>>>> not
>>>> down, so it gets up in between the cover and the car.
>>>>
>>>> Cheers
>>>>
>>>> Alan
>>>>
>>>>
>>>>
>>>> ----- Original Message ----- 
>>>> From: "mike hicks" <mhicks130 at cox.net>
>>>> To: <virtualvairs at corvair.org>
>>>> Sent: Tuesday, March 10, 2009 2:52 AM
>>>> Subject: <VV> Car Covers
>>>>
>>>>
>>>>>I got one from Costco for $40-ish and I love it.  It's got wind straps
>>>>> too.  It's holding up better than the one I got from Clarks (Evolution
>>>>> 4) did.  It does leave "dust" on the car though.  My car is NOT a show
>>>>> car though.  It's mostly to keep water out (it leaks by itself) and
>>>>> bird
>>>>> poop off.  It does that well.
>>>>>
>>>>> You do have to wait until Costco has them though, you know how Costco
>>>>> is.
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