Are these appropriate for coastal climates where there is no direct saltwater spray (a deck in a coastal climate)?

We do have experience with customers who have installed in coastal areas with no issues however we always advise to use a stainless steel cleaner or wax sealant to mitigate any possible rust issues. Due to many factors that dictate climate there is no one answer we can provide for all coastal areas. If needing additional information please feel free to contact Dolle USA directly.