I have about six outside corners, plus about 30 feet of soffit corner to install today. I am using the steel corners. I bought some 1 1/2" roofing nails for the ceiling corners, and some one inch for the 1/2 inch drywall. I also have a pneumatic gun that shoots one inch staples but I am thinking I need longer staples? Anyway, are roofing nails fine for this application?