I am trying to install a hot water baseboard loop in an upper level and I have never done any soldering or copper plumbing before. On the whole, I think the joints are coming out well, but I have a little doubt about one or two. The loop isn't complete, so there has never been water in it. My question is can you re-heat the joints in question and simply add more solder to the top of the existing solder? I have 3/4" Type M copper pipe and heating elements (Slantfin 15). Thanks in advance.