First milk are still very jumpy about orbeseal, we have to have a piece of paper to say that we've been trained in its use, which boils down to being careful to strip it out after calving, for several days. Its sometimes surprising how long after calving you can still find a speck, we found this more so when we used orbeseal with antibiotics, so now we use one or the other. Don't take my word for it though, make your own observation.