After spraying the prints (Moab Kayenta) for my double sided book using Hama Inkjet Fixierspray Matt (Germany) I found the surface to feel more closed and the amount of color rubbed onto the opposite page ist significantly smaller.
OTOH black areas become lighter/silver on the surface exactly where the papers are rubbing each other, but this is not as bad as before with color on the opposite page.
I can not comment on UV resistance, in which the sprays are said be quite bad. I read a test about this and the conclusion was that hair spray had the best UV resistance on inkjet prints. But, guys, do not use hair spray, the prints will paste
Using the Hama spray the colors of the prints are not affected, neither the look of the paper.
Still I have to wait for longtime conclusions. But so far the spray was a good try. Also I do not ship my book, I visit my future clients personally.
Best,
Clem