I have a brazing related question. Do all braze materials have capillary action? I've watched a lot of videos and to me it ofte looks like when people are brazing, with a copper based braze rod of some kind, that there isn't any capillary action going on like what can be clearly seen with silver soldering videos or soft soldering, there you can clearly see it in action. But I can't remember having seen it when somebody has been brazing.