Hot-dipped galvanized, aluminum and stainless steel fasteners are all corrosion-resistant and can be used to fasten Western Red Cedar. Other types of nails are not recommended. They can rust and disintegrate and react adversely with the natural preservative oils present in cedar resulting in unsightly stains and streaks. Copper nails also react with cedar and should not be used. Stainless steel nails are the best choice, especially if trim boards are to be finished with transparent or semi-transparent stain. Use No. 304 stainless for general applications and No. 316 for seacoast exposures. For best results use splitless fasteners designed for siding installation. This type of nail has a thin shank and blunt point and is available with a ring or spiral shank. Fastener length should be adequte to provide a minimum penetration of 1-1/2 inches into solid wood.