Garth,
 Surface weathering is common with my 15 minute cook time, but inner dry rot
is eliminated.  I suspect only a mm. or 2 is subject to deterioration.
There is no paint to chip off, and you can dip painted equipment, also.  The
paraffin seals the wood pores to moisture absorption.  I haven’t painted for
about 20 years!  The woodware does not appear to suffer much, only the
screaming fungi!
   Another point is the boxes are free of beeswax and propolis, and this
method at a higher temperature kills AFB spores, as reported in the American
Bee Journal last year, from Argentina.  They used a hotter temperature than
I do and cook frames from which diseased comb was cut.
 Regards,
 Charles Andros
 Linden Apiaries since 1973
 Beekeeping Supplies
 Former NH/VT Apiary Inspector '78-’89
 Residence: Latitude: 43° 05’ North, Longitude: 72° 21’ 15" West, Elevation
 1200’
 Keeper of 41 two-queen colonies for honey, pollen, propolis, pollination,
 nuclei, beeswax, apitherapy, and education