[Boatanchors] Micamold Recovery

[David Stinson]

I recently acquired a lot of NOS, unused "Micamold"-like
capacitors with varying values- most around .01 uFd 
at 250-600 Volts.  
Most are the square and rectangular Micamolds 
with some Cornell and Sprague in the mix.
I randomly selected 50 for testing.  21 of the lot displayed
varying amounts of leakage current and were set aside.
Two tested "open" and were discarded.
I subjected 7 of the "tested good" caps to 250 VDC
for 12 hours.  None developed leakage.  They and 
the remaining "good" ones went into my parts stock.

I placed the remaining 21 "leaky" caps in a disposable
pie pan and put them in a 300-degree electric oven
 for 1.5 hours, then turned the oven off and let them 
cool undisturbed for two hours.
The larger rectangular caps leaked some oil.
A couple of the square caps had a slight "bulge"
in the center from (I assume) gas or steam pressure.
After cleaning them with a disposable towel,
I retested the capacitors and all save *one* now
tests "good."  No leakage and all but three are within
"earshot" of their marked value.  
The three test a bit low (i.e a .01 that tests .006)
but still "good" as-in no leakage at that value.
Have three of these caps sitting at 500V and 
three of them at 250 V and will keep them there
for 12 hours to see if they start leaking again.

If they hold-up, I'd like to coat them with something 
to keep the water out for another 70 years.
A friend suggested boiling them in clean beeswax,
which sounds messy, LOL.

Thoughts?
73 DE Dave AB5S