toning watercolor paper

i tried an experiment  on my watercolor paper, using staining pigments to tone it.
i'm not happy with it
this is what i did
i mixed up a solution of pigment (pthalo blue 15:3) distilled water, and oxgall
i wet the paper back and front and lightly wiped off the shiny spots-
and when it was sort of damp and flat washed on the pigment with a large flat soft brush, as evenly as i could manage....
let dry and did it again-
the surface i would imagine would be wonderful for colored pencil or even pastel
but i don't think it will be a good idea for gouache, it's already buckling like crazy- not what i wanted at all
now the next logical thing is to just attempt to work with the stonehenge which while i am not totally crazy about the colors....at least is 100% cotton and i know i can use, although i would really like to mount it
and if i can find an archival glue i will....
so far all the so called archival glues aren't...... which leaves me with hide glue
so i  will have to think about that for a while