White Lightning makes a gel, is that available in Canada?
http://www.grandcircuitinc.com/products/white-lightning®-60-ml-gel
I’ve used that (or the mastitis treatment) along with packing the sulcus with Hoof Phelt. It doesn’t absorb water and helps open it up.
Apply treatment (White Lightning gel or the mastitis treatment) and then stuff the crack with strips of Hoof Phelt. Use a hoof pick to get it in. At first you can stuff a lot in there, but eventually as it opens it will be less and less.