Stick welding stainless isn't too different from regular stick welding, but it's a bit trickier since stainless steel holds heat longer, so you'll need to watch your travel speed unless you want a warped mess. Use 308, 309, or 316 rods depending on the type of stainless you're welding, and keep the arc tight to avoid excessive spatter. As for material treatment, stainless forms a chromium oxide layer that gives it corrosion resistance, so if you overheat it or don't clean up the weld properly, you can ruin that protective layer. Post-weld cleanup with a wire brush or pickle paste helps restore corrosion resistance unless you want your stainless to rust like a cheap grill left out in the rain.
