BZB, I like to spray with water, sprinkle with seeds, spray again,(this helps them stick), then slash. then into oven. If done in this order, when the bread does its 'oven bounce' it has a nice pattern on top. Some times it is difficult to slash if the dough is very wet. Experts say that the slash should be 1 cm. deep, but this depends on size of loaf.
I will try and post a photo of the pattern that i mention.