[ARC5] Tropical Coating -MFP

[J. Forster]

I, for one, would love the recipie, AND what the solvent for removing it
is (if any).

-John

=============



> On 21 Feb 2010 at 11:19, Gene Smar wrote:
>
>>      What your are probably seeing is what is known as MFP - Moisture
>> and
>> Fungus Proof - coating.
>
> MoistureFungusProofing - MFP
>
> Yes. I love the smell of that stuff.
>
>>  It was applied after assembly to all WWII and
>> Korean War vintage milrads.
>
> Not necessarily all. It depends on when it was applied. Early in the war,
> it
> went on gear going to the Pacific and other high-humidity areas. Later, as
> more became available, it was applied to all gear.
>
>>      Some time back there was a thread hereabouts that described the
>> exact
>> components that went into the coating.  IIRC, it was bees wax and
>> varnish.
>
> It also contains formaldehyde.
>
> As I remember it, our previous discussion on the subject was also attended
> by an industrial chemist who advised against our attempting to recreate
> the
> goop as the process was somewhat dangerous.
>
> Either when being made, or when liquid, MFP is poisonous. It isn't when
> dry,
> and any fumes from removing it with heat to solder are not dangerous
> either.
>
> I may have those discussions (and I am not ever sure they were from THIS
> list) saved in my voluminous files. (I am in information junkie).
>
> If we are interested enough I will dig out the formula for you.
>
> In any case, the stuff was almost completely effective for its purpose,
> which
> was to prevent moisture damage to electronic gear and the subsequent
> appearance of copious quantities of fungus which made the gear inoperable.
>
> In any case, I love the smell of the stuff.
>
> Ken Gordon W7EKB
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