Re: [ATM] dew heater ..Resistive Paint

["matt" <mariusrf@bellsouth.net>]

I haven't used such a thing in a long time but it used to be sold in small
quantities for car rear window defroster repairs.
You know, the grid on your car rear window . Auto parts stores might be a
good start.


best regards,
matt tudor

-----Original Message-----
From: Malcolm Macdonald <toliman@wave.co.nz>
To: atm <atm@atmlist.net>
Date: Saturday, January 01, 2005 3:01 AM
Subject: Re: [ATM] dew heater ..Resistive Paint


>
>----- Original Message -----
>From: "Jerry Reddell" <jerry.p.reddell63@sbcglobal.net>
>To: <atm@atmlist.net>
>Sent: Saturday, January 01, 2005 12:05 PM
>Subject: RE: [ATM] dew heater ..Resistive Paint
>
>
>
>
>>
>> It is not cheap and I don't know if one can purchase it in a 1 oz size.
>> The
>> actual total resistance depends of the thickness, width and length of the
>> painted stripe... A thin, narrow, long stripe makes a higher resistance.
>> Thick, wide and short stripe give a lower resistance.  Application
usually
>> involves use of a template to control the thickness ( squege type
>> application) or a template and empirically derived spray painting times
>> and
>> motions...
>>
>> For a diagonal, I would expect one could just brush it on relatively
thin,
>> and let the external controlled current flow establish the wattage.
>>
>> Jerry Reddell
>>
>> -----Original Message-----
>> From: Bob May
>>
>> In the electronics industry, there is a product that is called
"resistance
>> paint".  It isn't cheap as paint goes but it does an excellent job of
>> providing a resistance to current flow just like a resistor does.  The
>> interesting thing is that it is measured in ohms per cube.  Longer lines
>> of
>> the paint make larger resistances while wider lines drop the resistance.
>> If
>> you need more power then you scale the size of the patch up.
>
>Jerry and Bob,
>
>     Thanks for your replies. I wonder if it is available here in New
>Zealand. I will go shopping, armed with a printout of your replies, to
prove
>to the glassy eyed sales people that such a product exists.
>
>    Malcolm.
>
>
>
>
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