Proven fuel proof coating for field box -summary so far

[Bill Pritchett]

yes!  That's it.....


----- Original Message ----- 
From: "Verne Koester" <verne at twmi.rr.com>
To: <discussion at nsrca.org>
Sent: Monday, August 22, 2005 11:05 PM
Subject: Re: Proven fuel proof coating for field box -summary so far


> Bill,
> The nitro or the poly?
>
> Verne
>
>
> ----- Original Message ----- 
> From: "Bill Pritchett" <phelps15 at comcast.net>
> To: <discussion at nsrca.org>
> Sent: Monday, August 22, 2005 6:22 PM
> Subject: Re: Proven fuel proof coating for field box -summary so far
>
>
>> Verne:
>> It's the stuff we like to smell, right?
>> hehe
>> Bill
>>
>> ----- Original Message ----- 
>> From: "Verne Koester" <verne at twmi.rr.com>
>> To: <discussion at nsrca.org>
>> Sent: Monday, August 22, 2005 5:10 PM
>> Subject: Re: Proven fuel proof coating for field box -summary so far
>>
>>
>>> Tom,
>>> I finished a flight box with Minwax polyurethane 20 years ago and it's 
>>> still going strong. Lots of 30% nitro fuel spilled on it through the 
>>> years. This is the old fashioned polyurethane, not the water-based 
>>> stuff.
>>>
>>> Verne
>>>
>>>
>>> ----- Original Message ----- 
>>> From: "Tom Simes" <nsrca at shinymetalass.com>
>>> To: <discussion at nsrca.org>
>>> Sent: Monday, August 22, 2005 4:50 PM
>>> Subject: Re: Proven fuel proof coating for field box -summary so far
>>>
>>>
>>>>
>>>> Thanks for the feedback everybody, to summarize, here is what I think I
>>>> understand about the finishes so far.  If you have first hand 
>>>> experience
>>>> contradicting this, please let me know!
>>>>
>>>> Lacquer:  From what I've read, aircraft dope is a catalyzed lacquer and
>>>> aparently the catalyst used determines how fuel/nitro tolerant the
>>>> finish will be.  Don't know what the "good" catalyzing agents are, but
>>>> apparently non-catalyzed lacquer is not fuel proof at all.
>>>>
>>>> Epoxy / finishing resin:  Definately highly fuel resistant, but the
>>>> longest pot life epoxy I regularly use is 30 minute and so I don't
>>>> really have a need for the extra 1/2 quart or so I would need to buy
>>>> (not available in < 1 qt. quantities as far as I know).  Even the West
>>>> system stuff is not naturally UV resistant - they recommend top coating
>>>> with a UV resistant varnish.
>>>>
>>>> Spar varnish:  Should be color stable and highly UV resistant.  May
>>>> become brittle and succeptable to cracking / crazing.  Should be fuel /
>>>> nitro resistant to some degree.
>>>>
>>>> Polyurethane (exterior/spar):  Should be color stable, very durable and
>>>> highly UV resistant.  At least the Varathane water bourne acrylic 
>>>> flavor
>>>> is reported to not be fuel resistant.
>>>>
>>>> So far I am leaning towards either a non-acrylic polyurethane or the
>>>> spar varnish because of durability and ease of application, but I'm
>>>> still not clear on how fuel resistant the various brands / flavors of
>>>> these finishes are.  I may end up buying the smallest quantities I can
>>>> get of the spar varnish and polyurethane and conducting some
>>>> experiments.
>>>>
>>>>
>>>> Tom
>>>>
>>>> _____________________________________________________________________
>>>>
>>>>       |  ,  |               Tom Simes
>>>> ---------(@)---------        AMA 230068
>>>>        --|--                NSRCA 3830
>>>>          '                  nsrca at shinymetalass.com
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>>>
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>>
>>
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