The material I mentioned previously as being a surface treatment for
wood rhat is uded outside is EVERwood.
 
It is described as being "a non-toxic, penetrating, alkali-activated
silica aero gel that seals, waterproofs, hardens and preserves most
untreated wood products".
 
It is applied to damp wood by spraying, dipping, brushing or rolling.
 
It is a product of Con-Seal, Saskatoon, Sak. Canada
 
It costs $940 per 55 US gallon drum, and less if bought in multiple
drum lots.
 
I don't know much about it except the claims made for it are
impressive, and when applied to as wood sample in my presence, it
penetrated quickly and migrated some paint to the surface.
 
Perhaps someone has had some experience with such material.  The cost
seems rather high, but its other properties make it attractive.
 
Regards
 
Allen
 
W. Allen Dick, Beekeeper                                         VE6CFK
RR#1, Swalwell, Alberta  Canada T0M 1Y0
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Honey. Bees, & Art <http://www.internode.net/~allend/>