So it seems sawdust is about the best fluxing agent (or reducer, or oxidizer). Even one post said Pine sawdust was even better because of the pine sap. My question is the size of the sawdust. Is it better to use course or fine powder sawdust?
My dad also does woodworking, so I have access to rough sawdust (chainsaw, planer), or down to ultra fine sawdust such as sander dust. Which one might be better?
Taz