Except for Canada's "Kiosk" stamps (which are probably never seen anyway),
all Canadian stamps
will soak very nicely, including all self-adhesives.
Canada Post has specifically requested that the paper manufacturer include something on the back of stamps (sorry, I don't know the technical aspects) so that they can soak. [this was told to a group of collectors by
Canada Post's director of stamp services, after a group tour of the Lowe-Martin printing plant in Ottawa several years ago.] This is quite different from some USA stamps.
Robin Harris