1) the fluid evaporates very quickly..not much cleanup.
2) somewhere photo.net has described inexpensive home-made antinewton
glass carriers for 8000/9000 and these might (?) be used as wet mount
carriers.
3) film flatness is easy with antinewton glass or even with a good
glassless carrier (which is not standard with V or 5000, but was
standard with IV). wet mounting reportedly facilitates better Dmax, but
it may not contribute to inkjet images that are well managed in
Photoshop.. certain kinds of scenic images intended for mural
enlargements might benefit, but I don't believe prints within my size
range (up to 13X19) would benefit at all, certainly not on matte paper.
4) one can construct an antinewton glass carrier for V and probably for
5000, but Nikon's FH-3 film carrier does a beautiful job of flatness
without glass so I've lost my enthusiasm for having a machine shop
build something special...though FH-3 is hard to find now, and it's
fussy to use. antinewton glass for the IV's FH-3 carrier would cost
almost $40 and would probably break occasionally in use, according to
what I've read..it has to be very thin glass to be used in that
carrier. I use antinewton glass with my flatbed and Doug's special
carrier for 120...it's 1/8" thick, not likely to break, and it does
contribute significantly to sharpness.