hmmm, that number is a msds number? i get one hit on google and the sheet refers to several types of rod. I just use regular low carbon, copper coated O/A welding rod, 3/32 or 1/8 iirc. I have no idea why you are getting that crust - sorry, like i say i don't want to represent myself as a competent or expert welder, hopefully the bump brings forth some experts.
there's one now
