>   Can anybody knowledgable person think of any good reason to not include
> this silver powder/flake in the hysol?>>

 

I don't understand the question but, being weird, let me try this.  The Lancair Legacy (at least the one I dealt with for a while) skins were "bonded" at the skin joggles and basic skin to skin joints with "black" epoxy.  I believe that chopped carbon fabric was used in the epoxy (thus, making it black) - check with Lancair.  In any event, there was electrical conductivity between these parts.  Hysol is generally used to bond the skin to flanged ribs and other structural elements where these elements are made of non-conductive glass - no need to use a conductive adhesive. 

 

For conductivity to outer wing panels, control surfaces, canopy and cowling, straps can be used.  If one is installing static wicks, there is conductive (though pricey) silvered bonding agents for the wick to fuselage terminus.  Remember that Legacy wingtips are made of glass and wicks located there require a bonding strap.