I would not use Oxy-acetylene.....way too much heat. Just acetylene, propane or map gas will give you the control you need. If you burn the rosin flux then you have a real problem on your hands and will need to pull the ribs completely and clean the area. The trick to using rosin flux and 50/50 is to work within the small temperature window between where solder flows on the low end and where flux burns on the high end. If you keep your work within those parameters it will go just fine. Too much heat is your enemy in this application.
Last edited by SKB; 08/14/18 08:06 AM. Reason: added text
