What is MFP? 73 W4PQW

Roger D Johnson wrote:
I removed the MFP from the knobs of an old HRO I
purchased. I subsequently decided that this was a
mistake and want to restore the knobs to original.
Is there anything that can be sprayed/painted on to
restore the original look of the MFP?

Thanks, Roger

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wrote:
What is MFP? 73 W4PQW

MFP stands for Moisture Fungus Proofing

It is a varnish with an mild poison added. It tends
to turn lemon yellow in color, and really looks kind of
dowdy.

The military sprayed lots of electronic equipment, inside
and out, with MFP. Sometimes they masked of parts that
shouldn't be sprayed, sometimes they didn't.

-Chuck

Hi,
Chuck wrote:

MFP stands for Moisture Fungus Proofing

It is a varnish with an mild poison added.

I understand it was copper naphthenate.

73, Alan

And vernacularly referred to as "tropcial varnish."

It can still be found in spray cans, furnished even in more recent
years to MIL repair facilities for touchup, such a SIMA's etc. That
is, unless it's me looking for a can...