Heh, funny. I tried it a few times wet and always ended up with streaks and stuck with dry after that. I don't even know a good base to being with.
Regarding archival quality: fumed silica is pure silica, which in effect, should have no, to little effect on the paper itself, nor the metals in the print. Granted, it's so new who really knows? We did do a trusty NM test where we tape a print to a door facing the southern sky, which here in NM is always sunny and at 7000', quite harsh. No fading or issues after a handful of days, which usually will destroy some of the older RC paper emulsions, etc. Not scientific, but confidence inspiring.