Hi guys. I need to Weld (mig) some 316 Stainless rail to the mild steel deck of my sailboat. the guy at the welding shop recommended 309 wire, so I picked up some of that, and he said that I could probably get away with using 75/25 if I'm diligent about penetration. Can I get by with using the 309 to weld two pieces of 316 together and then the entire assembly to the deck, or do I have to have 316 filler for that joint? I've obviously never welded stainless before, so any noob tips things I need to watch out for?