Might want to keep an eye on those calipers. As I understand it, part of their job is to conduct heat away, and the dip might be affecting their ability to do that by insulating them. Another possible scenario is that the heat has some effect on the finish of the dip, possibly hardening it or making it brittle. If that happens, it will be quite a bit harder to remove later--and it looks like removing some of it may be necessary at some point, since it looks like the bleeder nipple is covered.
All speculation here, just food for thought.