Digital BW, The Print

Who has tried sizing uncoated papers (before printing)?

As a gumprinter I am sizing all my papers (mainly watercolour and
rives BFK) with (formalin) hardened gelatin.
I tried these papers with Epson OEM dyes in a 1200 with no result.
The dyes float off on top of the hardened gelatin.

Will this be different with pigment based inks (I ordered a CIS and
MIS quad black inks this week)?

After receiving the CIS and inks I will experiment with different 
coatings -  unhardened gelatin, hardened gelatin, starch, PVA etc.

Who knows what coating is used by archival inkjet paper manufacturers 
(hahnemuhle, somerset etc.)? 

thanks,

Kees Brandenburg