Metal folks, a question. Is weldable paint like this one real or is it bs? This one claims to be 50% 316L stainless steel on application (I guess it's more of a coating than a paint in the usual sense, but it works the same way). Does anyone have experience with stuff like this? If so, do you actually weld over the paint and onto it, or do you weld through it to the metal surface below? If anyone knows how this works, please help me out.