Delivered cabinets & built ins to a condo job today. Contractor has to install a series of moldings to form a crown around all the walls that lay flat on the wall & ceiling rather than at a 45degree, so there is no room for a nailer strip. It has been a long time since I have done installs, so I'm wondering if there is a fastener that can shoot into metal with something like a serated edge to help hold. What are you fellas using these days??