I'm thinking of buying a TIG set up and making some parts for my next boat. Does anyone know if I need a specific alloy, or does it really matter? I've made some trolling motor mounts, a jack plate, and a few small support parts in the past and I've never had any issues even though I didn't know what alloy it was because it was all scrap. So I'm not really sure it matters too much. Also does it matter from a polishing perspective?