Hot-dipped galvanized nails not used in a nail gun are usually very distinctive. Often they have clumps of zinc on the shaft or the coating of zinc is somewhat uneven on some of the nails. You may even discover small ingots of zinc in the box or nail container.he point is, hot-dipped galvanized nails will do the job for 99% of the houses out there. I'd only specify stainless roofing nails if I lived at or close to the ocean. Hot-dipped galvanized nails can last well over 100 years in non-oceanic climates.